[2.0 M1] Missing breaking changes and other doc issues

[Curt Arnold]

I encountered several breaking changes that were not documented in 2.0_migration_guide.html.

DataProxy, DataReader, BaseListLoader (likely others) now take 1 parameter class and not two.

Validator is no longer generic

Field.isValid is now final

fireEvent(int, BaseEvent) has been changed to fireEvent(EventType, BaseEvent)

com.extjs.gxt.ui.clients.Events has been moved to com.extjs.gxt.ui.clients.event.Events and member names changed.

Also, setup.txt still mentions ext_all.css which has been renamed gxt_all.css

I haven't confirmed this, but I'm thinking that GXT 2.0 requires at least GWT 1.6.2 (got a lot of unloadable classes with GWT 1.6.1 that went away after switching to GWT 1.6.4).

[sven]

It requires the stable release of GWT 1.6 and not any milestone or rc release.

[sven]

Also the docs arent fully ready yet. It is a first milestone.