Fix code style and xmldocs, add Roslynator analyzer - #1030

Add [Roslynator](https://github.com/JosefPihrt/Roslynator) and fix some
code style issues found.

`dotnet_analyzer_diagnostic.severity` is set to `none` to stop `dotnet
format` from editing a lot of files, even unrelated issues, probably
detected by other analyzers, and a lot of issues are disabled. Currently
only these are enabled:

```
dotnet_diagnostic.RCS1036.severity = warning # Remove unnecessary blank line.
dotnet_diagnostic.RCS1037.severity = warning # Remove trailing white-space.
dotnet_diagnostic.RCS1097.severity = warning # Remove redundant 'ToString' call.
dotnet_diagnostic.RCS1138.severity = warning # Add summary to documentation comment.
dotnet_diagnostic.RCS1168.severity = warning # Parameter name 'foo' differs from base name 'bar'.
dotnet_diagnostic.RCS1175.severity = warning # Unused 'this' parameter 'operation'.
dotnet_diagnostic.RCS1192.severity = warning # Unnecessary usage of verbatim string literal.
dotnet_diagnostic.RCS1139.severity = warning # Add summary element to documentation comment.
dotnet_diagnostic.RCS1211.severity = warning # Remove unnecessary else clause.
dotnet_diagnostic.RCS1214.severity = warning # Unnecessary interpolated string.
dotnet_diagnostic.RCS1225.severity = warning # Make class sealed.
dotnet_diagnostic.RCS1232.severity = warning # Order elements in documentation comment.
```

Note: 
* There are a lot more issues to fix, for now I disabled a lot of checks
and fixed only a bunch.
* Future: enable more of `dotnet_diagnostic.RCS` currently disabled,
e.g. XMLDoc checks, to get better code docs

Other fixes:
* fix incorrect namespaces in copilot chat
* use static property for regex
* typos, missing copyright
* switch from CA1032 to RCS1194 to cover more exception ctors

Add [Roslynator](https://github.com/JosefPihrt/Roslynator) and fix some
code style issues found.

`dotnet_analyzer_diagnostic.severity` is set to `none` to stop `dotnet
format` from editing a lot of files, even unrelated issues, probably
detected by other analyzers, and a lot of issues are disabled. Currently
only these are enabled:

```
dotnet_diagnostic.RCS1036.severity = warning # Remove unnecessary blank line.
dotnet_diagnostic.RCS1037.severity = warning # Remove trailing white-space.
dotnet_diagnostic.RCS1097.severity = warning # Remove redundant 'ToString' call.
dotnet_diagnostic.RCS1138.severity = warning # Add summary to documentation comment.
dotnet_diagnostic.RCS1168.severity = warning # Parameter name 'foo' differs from base name 'bar'.
dotnet_diagnostic.RCS1175.severity = warning # Unused 'this' parameter 'operation'.
dotnet_diagnostic.RCS1192.severity = warning # Unnecessary usage of verbatim string literal.
dotnet_diagnostic.RCS1139.severity = warning # Add summary element to documentation comment.
dotnet_diagnostic.RCS1211.severity = warning # Remove unnecessary else clause.
dotnet_diagnostic.RCS1214.severity = warning # Unnecessary interpolated string.
dotnet_diagnostic.RCS1225.severity = warning # Make class sealed.
dotnet_diagnostic.RCS1232.severity = warning # Order elements in documentation comment.
```

Note: 
* There are a lot more issues to fix, for now I disabled a lot of checks
and fixed only a bunch.
* Future: enable more of `dotnet_diagnostic.RCS` currently disabled,
e.g. XMLDoc checks, to get better code docs

Other fixes:
* fix incorrect namespaces in copilot chat
* use static property for regex
* typos, missing copyright
* switch from CA1032 to RCS1194 to cover more exception ctors

Add [Roslynator](https://github.com/JosefPihrt/Roslynator) and fix some
code style issues found.

`dotnet_analyzer_diagnostic.severity` is set to `none` to stop `dotnet
format` from editing a lot of files, even unrelated issues, probably
detected by other analyzers, and a lot of issues are disabled. Currently
only these are enabled:

```
dotnet_diagnostic.RCS1036.severity = warning # Remove unnecessary blank line.
dotnet_diagnostic.RCS1037.severity = warning # Remove trailing white-space.
dotnet_diagnostic.RCS1097.severity = warning # Remove redundant 'ToString' call.
dotnet_diagnostic.RCS1138.severity = warning # Add summary to documentation comment.
dotnet_diagnostic.RCS1168.severity = warning # Parameter name 'foo' differs from base name 'bar'.
dotnet_diagnostic.RCS1175.severity = warning # Unused 'this' parameter 'operation'.
dotnet_diagnostic.RCS1192.severity = warning # Unnecessary usage of verbatim string literal.
dotnet_diagnostic.RCS1139.severity = warning # Add summary element to documentation comment.
dotnet_diagnostic.RCS1211.severity = warning # Remove unnecessary else clause.
dotnet_diagnostic.RCS1214.severity = warning # Unnecessary interpolated string.
dotnet_diagnostic.RCS1225.severity = warning # Make class sealed.
dotnet_diagnostic.RCS1232.severity = warning # Order elements in documentation comment.
```

Note: 
* There are a lot more issues to fix, for now I disabled a lot of checks
and fixed only a bunch.
* Future: enable more of `dotnet_diagnostic.RCS` currently disabled,
e.g. XMLDoc checks, to get better code docs

Other fixes:
* fix incorrect namespaces in copilot chat
* use static property for regex
* typos, missing copyright
* switch from CA1032 to RCS1194 to cover more exception ctors

Add [Roslynator](https://github.com/JosefPihrt/Roslynator) and fix some
code style issues found.

`dotnet_analyzer_diagnostic.severity` is set to `none` to stop `dotnet
format` from editing a lot of files, even unrelated issues, probably
detected by other analyzers, and a lot of issues are disabled. Currently
only these are enabled:

```
dotnet_diagnostic.RCS1036.severity = warning # Remove unnecessary blank line.
dotnet_diagnostic.RCS1037.severity = warning # Remove trailing white-space.
dotnet_diagnostic.RCS1097.severity = warning # Remove redundant 'ToString' call.
dotnet_diagnostic.RCS1138.severity = warning # Add summary to documentation comment.
dotnet_diagnostic.RCS1168.severity = warning # Parameter name 'foo' differs from base name 'bar'.
dotnet_diagnostic.RCS1175.severity = warning # Unused 'this' parameter 'operation'.
dotnet_diagnostic.RCS1192.severity = warning # Unnecessary usage of verbatim string literal.
dotnet_diagnostic.RCS1139.severity = warning # Add summary element to documentation comment.
dotnet_diagnostic.RCS1211.severity = warning # Remove unnecessary else clause.
dotnet_diagnostic.RCS1214.severity = warning # Unnecessary interpolated string.
dotnet_diagnostic.RCS1225.severity = warning # Make class sealed.
dotnet_diagnostic.RCS1232.severity = warning # Order elements in documentation comment.
```

Note: 
* There are a lot more issues to fix, for now I disabled a lot of checks
and fixed only a bunch.
* Future: enable more of `dotnet_diagnostic.RCS` currently disabled,
e.g. XMLDoc checks, to get better code docs

Other fixes:
* fix incorrect namespaces in copilot chat
* use static property for regex
* typos, missing copyright
* switch from CA1032 to RCS1194 to cover more exception ctors