clang-format codebase

Some editing/rewriting of example, fixed links, etc.

Fixes for tests

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Make CMake find_package work for preinstalled libprotobuf on Raspbian.

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Add pthread detection and library reference. Add protobuf library reference to grpc_plugin_support.

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Make cmake protobuf detection changes in template.

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Package name needs to start with uppercase for find_package(Protobuf)

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Add pthread detection and library reference. Add protobuf library reference to grpc_plugin_support.

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Make cmake protobuf detection changes in template.

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Package name needs to start with uppercase for find_package(Protobuf)

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Uppercase variable names to match convention of the whole file.

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Add pthread detection and library reference. Add protobuf library reference to grpc_plugin_support.

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Merge corrections.

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Parametrize package provider mode for find_package protobuf.

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Change package type variable name. Use variant uppercase variable for checking protobuf package presence.

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Lowercase variand of protobuf found check in find command.

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Add rule to include protobuf dirs.

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Add pthread detection and library reference. Add protobuf library reference to grpc_plugin_support.

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#	Add pthread detection and library reference. Add protobuf library reference to grpc_plugin_support.

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#	Add pthread detection and library reference. Add protobuf library reference to grpc_plugin_support.

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#	Merge corrections.