Also made the Xcode project link.

Tested: on OS X.

Tested: on OS X.

- Add parse handling of .proto struct and field doc comments (enums and
their values were already handled)
- Add FBS generation handling of doc comments for structs, their
fields, enums, and their values (requires linking idl_gen_general in
the test binary build)
- Tested using test.proto|golden with doc comments added.  Xcode run of
flattest passes.

Change-Id: Idff64dd8064afba227174ab77d2c7be22d006628

Change-Id: I72aa590a0dc13771ca2f17857824f8b6fd76c78f

Change-Id: I3480de9157fd6d0eeb123e77e448bd57c75c74ad
Tested: on OS X

Change-Id: I5e21a08fe4b93382e5fbc3b911de5634b7aa88b9
Tested: on OS X.

Change-Id: I54ce51f16043664d706a79d1b31f2569f3311b70
Tested: on OS X

Implement code generation and runtime library for Go, derived from the
Java implementation. Additionally, the test suite verifies:

 - the exact bytes in the Builder buffer during object construction,
 - vtable deduplication, and
 - table construction, via a fuzzer derived from the C++ implementation.

Change-Id: Ib95a019c684891def2b50281e570b4843fea7baa

Change-Id: I60c20e184f51906e6e2fb3880d593584aac0e2fb
Tested: on OS X

Change-Id: Ife9775fdedc9e084c1e826ef13dff06a1b1b2ec2
Tested: on Windows and OS X.