* Add FLATBUFFERS_COMPATIBILITY string
- Add a new __reset method NET/JAVA which hides internal state
* Resolve PR notes
* Use operator new() to __init of Struct and Table
* Restrict visibility of C# Table/Struct to internal level
* Support binary search for struct in cpp
CreateVectorOfSortedStruct is provided for convenience.
* fix continuous-integration error
* add generated files
* compile Ability.cs in csharp test
* compile Ability.cs in csharp
* modify according to code review