Improve roslyn obsolete calls and copy SharpGen.Runtime.COM nuget pac…

…kages as well.

Merge pull request #223 from Sewer56/trimming-com

Implement nullable handle in other places.

Import COM runtime, many marshalling improvements, update CastXML (#211)

Generate DebuggerTypeProxy attribute for Vtbls automatically

Increase test coverage (non-integer CsFundamentalType alignment)

Fix Release dispose condition, introduce new helpers to Runtime

Also add VS/SDK location override ability.

Fix length relation with nullable arrays, simplify generated code

Strong name signing and minor fixes

Huge refactoring for immutability (#190)