Protocol Improvements

[djungelorm]

This is a summary issue of the various protocol Improvements:

• Inheritance Add proper inheritance support for remote objects in clients #8
• Constructors Calling constructors #9
• Mark procedures obsolete Highlight deprecated properties/methods in documentation and client-gen #10
• Mark parameters as nullable Add attribute to mark parameters as nullable krpc#678
• Clean up default attribute annotation KRPCDefaultValueAttribute for parameters krpc#677
• Extension methods Extending an existing service? krpc#305 Add better support for PartModules from mods #11
• Client to server streams and batching calls Reverse stream / non-blocking control #12
• Stream removal behaviour Two identical streams are both deleted when calling RemoveStream on one of them #13
• Stream freezing (already supported in C++ client) Add stream freezing to all clients #14
• More communication protocols More Communication Protocols #15