In C#, plain field accessors should not be nonparametric methods
but should be standard property getters.
The accessor methods with parameters were renamed to `GetXxx`
because a method cannot be named identically to a property.
Also, `ByteBuffer.Position`, `FlatBufferBuilder.Offset` and
`FlatBufferBuilder.DataBuffer` are now properties instead
of nonparametric accessor methods, for more idiomatic C# style.
This is a breaking change, all client C# code accessing these
fields needs to be changed (i.e. remove those `()` or add the
`Get` prefix).
Issue: #77
Change-Id: Iaabe9ada076e5ea2c69911cf6170fdda2df3487e
Also cleaned up ByteBuffer usage in general: ByteBuffer.position
now universally indicates the start of a ByteBuffer.
Change-Id: Ic4bfb98f9df9501b8fc82de2c45db7d7311135ac
Tested: on Linux.
Also fixed flatc not outputting these identifiers for files
compiled on the command-line.
Bug: 16983987
Change-Id: I8b714cfea3a8e144fa52133f62b2f7eda6eb044a
Tested: on Linux
