* [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
Also made the C# implementation support unsigned types, and
made it more like the Java version.
Bug: 17359988
Change-Id: If5305c08cd5c97f35426639516ce05e53bbec36c
Tested: on Linux and Windows.
Include C# codegen in flatc and .NET FlatBuffer access via the
FlatBufferBuilder class
Tested: on Windows.
Change-Id: If5228a8df60a10e0751b245c6c64530264ea2d8a