Regenerating project files and massaging VS project files.

build.json

src/csharp/buildall.bat

templates/vsprojects/grpc.sln.template

templates/vsprojects/grpc_csharp_ext.sln.template

...projects/grpc_csharp_ext/grpc_csharp_ext.vcxproj.template

templates/vsprojects/sln_defs.include

templates/vsprojects/vcxproj_defs.include

vsprojects/gpr/gpr.vcxproj

vsprojects/gpr_test_util/gpr_test_util.vcxproj

vsprojects/grpc++/grpc++.vcxproj

vsprojects/grpc++_unsecure/grpc++_unsecure.vcxproj

vsprojects/grpc.sln

vsprojects/grpc/grpc.vcxproj

vsprojects/grpc_cpp_plugin/grpc_cpp_plugin.vcxproj

vsprojects/grpc_csharp_ext.sln

vsprojects/grpc_csharp_ext/grpc_csharp_ext.vcxproj

vsprojects/grpc_csharp_plugin/grpc_csharp_plugin.vcxproj

...s/grpc_objective_c_plugin/grpc_objective_c_plugin.vcxproj

vsprojects/grpc_plugin_support/grpc_plugin_support.vcxproj

vsprojects/grpc_protoc_plugins.sln