* Changed action=raw to use an Action subclass

* Changed action=raw to use an Action subclass
* Left RawPage with back compat code for extensions that use it
* Removed calls to Skin for gen=(css|js). Calling action=raw&gen=(css|js) will now unconditionally return empty content
* Removed Skin::generateUserJs() and Skin::generateUserStylesheet() since they were only used in RawPage