This patch includes all marshalling and proxy handling code on the
.NET side as well as the native side needed for a fully functional
UNO bridge.
It also includes some changes and corrections to net_basetypes and
netmaker needed for the bridge to work properly.
It also includes the FirstUnoContact example in C# as demonstration.
Change-Id: I406932938a4415d24408fb41ddfa7d8eeb5d1f94
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/170916
Tested-by: Jenkins
Reviewed-by: Hossein <hossein@libreoffice.org>
