* Added <autogenerated> in cs generator file header comment
#4287
* CS: Added xml-correct file header comment including "<auto-generated>...</auto-generated>"
code_generators.cpp: FlatBuffersGeneratedWarning() function replaced by compile time constant "GeneratedWarning"
also removed extra newlines at end of GeneratedWarning to be able to generate a xml well formed file comment for cs files
#4291
* code_generators: Changed static string GeneratedWarning back to function FlatBuffersGeneratedWarning()
#4291
* Added modified Unit-Test files
#4291
* idl_gen_general: Add autogenerated only in C# code
#4291
* C#: Fixed possible conflicts between usings and user-supplied namespace
C#: Added the global qualifier to using directives to prevent possible conflicts with the user-supplied namespace. Also prevents unintentional type hiding. Resolves issue #4242.
* Updated C# generated code files
The code generator was assuming all declarations for the current
file sit in the same namepace. Now uses the "on demand" namespace
switching we had for the forward declarations.
Also fixed a bug related to namespace lookup.
Change-Id: Ib54a3efbc752cbb9590302fa0707c0c73448db3d
Tested: on Linux.
