* Add overloads to Add/Put for ArraySegment and IntPtr
In order to allow using code to reduce memory allocations, add overloads to ByteBuffer's and FlatBuffersBuilder's Put/Add methods that take ArraySegment<T> or IntPtr respectively.
Also, adaptions to the c# code generator in flatc to emit corresponding CreateVectorBlock() overloads
* Add missing files generated with generate_code.py
The previous commit changed the C# code generate, but didn't contain the updated generated test files.
* Incorporate review findings
(1) Adhere to 80 characters limit.
(2) In FlatBufferBuilder.Add(IntPtr,int), move zero length check topmost and add sanity check against negative input
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