* [C#] support Object API
* fix sign-compare
* fix indent
* add new line before for loop.
* using auto whenever possible
* reduce the amout of blank lines.
* wip: support vectors of union
* done: support unions of vectors
* set C# version to 4.0
* remove null propagation operator
* remove auto property initializer
* remove expression-bodied method
* remove pattern matching
* add Example2 to NetTest.sh
* separate JavaUsage.md and CsharpUsage.md from JavaCsharpUsage.md
* add C# Object based API notes.
* support vs2010.
* remove range based for loop.
* remove System.Linq
* fix indent
* CreateSharedString to CreateString
* check shared attribute
* snake case
Adding an API reference for the supported languages.
General docs cleanup, including a new `tutorial` section that
supports all of the supported languages.
Added samples for each supported language to mirror the new
tutorial page.
Cleaned up all the links by making them `@ref` style links,
instead of referencing the names of the generated `.html` files.
Removed all generated files that were unnecessarily committed.
Also fixed the C# tests (two were failing due to a missing file).
Bug: b/25801305
Tested: Tested all samples on Ubuntu, Mac, and Android. Docs were
generated using doxygen and viewed on Chrome.
Change-Id: I2acaba6e332a15ae2deff5f26a4a25da7bd2c954
