[GSoC .NET Bindings for UNO, Week 9] old patches and managed bridge

[Ritobroto Mukherjee <ritobroto04@xxxxxxxxx>]

Hello everyone,

Here's a summary of this week's work:

- Addressed comments and suggestions left on previous patches, by
reworking the configure scripts and .NET-gbuild integration further.
Four patches ready to merge on my end.

- Started work on the managed (pure C#) bridge this week as a
distraction from the complexity of the native bridge. Progress is not
substantial enough for a patch just yet, but it's getting there.

Best regards,
Ritobroto