* Change C# generation script to use .pb.cs extension
* Rename generated C# files
This was performed by running generate_protos.sh and then removing the old files.
Notes:
- This does not change the conformance test generated C# code
- This does not change the compatibility C# code
- There's currently no clean-up operation in generate_protos.sh to remove old .pb.cs files (which would now be feasible)
- The changes to TestMessagesProto2.pb.cs are just due to formatting and a new Objective-C option
* Fix well-known type source files for C# Bazel build
* enable compatibility mode in codegen
* regenerate protos
* improve readability
* more robust way of figuring out path to old C# compiler
* add recent C# changes
The changes in the existing proto2 code are solely around presence bits. The new generator allocated presence bits more efficiently. (Previously bits were sometimes allocated but never used.)
Protobuf Team Bot
Jon Skeet
Jan Tattermusch
Joshua Haberman
Jan Tattermusch
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