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Comments changes, no functionality changes

Formatting changes,small cleanup,  no functionality changes

cmake test fixes

Fixes the following errors:

hash_map(17): error C2338: <hash_map> is deprecated and will be REMOVED. Please use <unordered_map>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have received this warning. [googlemock\gtest\gtest-printers_test.vcxproj]
hash_set(17): error C2338: <hash_set> is deprecated and will be REMOVED. Please use <unordered_set>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have received this warning. [googlemock\gtest\gtest-printers_test.vcxproj]
googletest\test\gtest_catch_exceptions_test_.cc(152): error C2220: warning treated as error - no 'object' file generated
googletest\test\gtest_catch_exceptions_test_.cc(152): warning C4297: 'CxxExceptionInDestructorTest::~CxxExceptionInDestructorTest': function assumed not to throw an exception but does
  googletest\test\gtest_catch_exceptions_test_.cc(152): note: destructor or deallocator has a (possibly implicit) non-throwing exception specification

There were already some checks for _MSC_VER in the code, so this commit
continues in that vein.

allow exepctions to be thrown in a destructor.

Casts char to unsigned char before calling isspace() etc to avoid undefined behavior (by Zhanyong Wan); removes conditional #includes keyed on GTEST_HAS_PROTOBUF_ (by Zhanyong Wan); publishes GTEST_HAS_STREAM_REDIRECTION (by Vlad Losev); forward declares some classes properly (by Samuel Benzaquen); honors the --gtest_catch_exceptions flag (by Vlad Losev).

Makes gtest print enums as integers instead of hex dumps (by Zhanyong Wan); improves the hex dump format (by Zhanyong Wan); gets rid of class TestInfoImpl (by Zhanyong Wan); adds exception handling (by Vlad Losev).