Greatly improve efficiency of generating additional types for really large projects.

- CompilationState is now "always up to date"
- Adding additional types is now divorced from a full "refresh" that starts over.

Suggested by: jat
Review by: spoon


git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4025 8db76d5a-ed1c-0410-87a9-c151d255dfc7
17 files changed