Ref: BZ 1388728
This backs out the stuff added in Bug 1295978. Ref: BZ 1295978, 1388728
This splits ScriptLoader up the same way Mozilla did with the exception of ScriptRequest due to the fact that ScriptLoader and ScriptRequest are interdependent and would create a circular dependency if split apart when not using unified building.
- Moves scripting parts of DOM into 'dom/script' - Renames nsScript{Loader/Element} to Script{Loader/Element} - Adjusts all callers