[CorDebug] Move as much code as possible into extension classes.
[CorDebug] Fix Call Stack tree.
[CorDebug] Implemented Custom Attributes for methods and stub code for DebuggerHidden.
[CorDebug] First attempt at fixing up evaluation.

Interfaces don't work yet. And class typing is screwed.
[CorDebug] Implement reading of interfaces.
[CorDebug] Removed a hackfix and removed duplicate member enumeration.
[Cordebug] Fix issues with interface listing. Also cache GetType queries.
[CorDebug] Implemented isCompilerGenerated check for Type Display Data.
[CorDebug] Fixed issue with properties whenever getter/setter was missing.