TypeDefFinder updates...
TypeDefFinder updates...

- Allow type refs to find the global <Module> type
- Update XML doc comment with exception info
- Use AllTypesHelper.Types() to get all nested types
- Remove useless locals
- Clear typeEnumerator in Dispose() (it's not readonly anymore)

yck1509/dnlib,ZixiangBoy/dnlib,ilkerhalil/dnlib,0xd4d/dnlib,jorik041/dnlib,picrap/dnlib,modulexcite/dnlib,kiootic/dnlib,Arthur2e5/dnlib