Added convenient create functions for Java/C#.

Bug: 15777857
Tested: on Linux and Windows.

Change-Id: I25db724349e2c801bb0e41137540507acd57cd03
Add enum name lookup method to Java/C# enums

Tested: on Linux for Java and C#

Bug: 15781151
Change-Id: I7cb97bcc01d986cac2b24aaf7cb29521ddaa2f6b
Generate headers from spec, add option for installing targets

Change-Id: I16ddb06e887e618fa871e842054115909fbf235c
Support for required fields.

Change-Id: I560c7ca11b3d665eecafb528f3737b7e139ca9b0
Tested: on Linux and Windows.
Added option to flatc to generate dependent header statements.

Bug: 17322776
Change-Id: I3a4d3cb4ccd40bc3200a87653aa0ab8ecb90ce60
Tested: on Linux.
Made flatc error messages look like what other compilers output.

Looks like MSVC on Windows and like gcc everywhere else.
For enhanced IDE clickability.

Bug: 17208371
Change-Id: Ie3e02658fccd3edfd464b4bacf4bc68c613a8570
Tested: on Linux and Windows.
Enums in C++ are now strongly typed.

Accessors and constructors now take enum types rather than ints.

Bug: 16570507
Change-Id: I4b50fd64ad2e662ea2481bc0ccea784326fb31c0
Tested: on Linux and Windows.
Fix vector of strings for Go

Mirrors Java patch 39d4b7e2bf

Change-Id: If8d0ab29f6eb508a156d468aeb0a9d5410149e53
Output multiline doc comments over multiple lines

Tested: on Linux

Bug: 15779934
Change-Id: I6f822f1705e443d8721ea208dcb021aad3c8715c
Fixed bug in convenient constructors for Java/C#

Also fixed Go unit tests not being up to date with recent schema
changes.

Change-Id: I42e619f9c5ea05f6f937c68a5c8a92462c46bce3
Tested: on Linux and Windows.
Python flatbuffers read support