* Update strings.
* Update fwlinks.

Fix for #5618
Scenario 1: Manually change files.associations. Bug: We weren't sending files.associations along with the settings change.
Scenario 2: Open a .C file. Bug: The language associations need to be changed before sending the didOpen.

With microsoft/MIEngine#1006, the debug adapter
supports 'quoteArgs' in pipeTransports. If the user wishes to handle the
quoting for pipeTransport arguments, they should set this field to
'false'. It currently defaults to true.

For example, if quoteArgs is 'true', the pipe command will result in
"bash.exe -c '/usr/bin/gdb --interpreter=mi'" If false,
it will result to "wsl.exe -c /usr/bin/gdb --interpreter=mi"

This PR enables the Debug Welcome Panel for c/cpp languages.

…iguration (#5453)

* Added system to store and query properties from the active C/C++ configuration
Co-authored-by: yngwe@farnsworth <yngwe@farnsworth>
Co-authored-by: yngwe@bender <yngwe@bender>

…riableCherryPick

custom configuration variable cherry pick

* Print launch.json to C/C++ Output Log

This PR adds a check in resolveDebugConfiguration so that if a user adds
logging.engineLogging = true in the launch.json, we will output the
resovled json in the C/C++ Output.

* Use GitHub bug notation and add title for log

Co-authored-by: Sean McManus <[email protected]>

* [cppvsdbg] Add logging ThreadExit and ProcessExit

This PR adds two log flags for ThreadExit and ProcessExit events.
This will remove the "The thread 10564 has exited with code 0 (0x0)."
and "The program '[24104] ConsoleApplication1.exe' has exited with code
0 (0x0)." messages.

Fixes:
- It doesn't check for a downgrade to non-insiders on startup, only when the setting changes.
- There was a bug with the timer code that checks for a new insiders every hour.
- It wasn't bypassing the autoUpdate check when the user manually switches the updateChannel.

* Update changelog for 0.29.0-insiders.