Reduces class and JSNI loading for RPC in devmode.

- Makes GwtScriptOnly work with JSNI methods.
- Modifies the RPC generator to tag native methods with GwtScriptOnly.
- Modifies the RPC generator to defer class loads of FieldSerializers until needed.

Review at http://gwt-code-reviews.appspot.com/1215801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9424 8db76d5a-ed1c-0410-87a9-c151d255dfc7
18 files changed