Created new CacheHelper which replaces the old Cache class and is accessible via the UmbracoContext.
Added new CachedPartial extension method to be able to cache the output of your partials (also by page and by member)
Added mew CacheHelperApplicationEventListener in order to automatically clear the partials cache when content is published, media or members is saved.
BeginUmbracoForm working for both local and plugin SurfaceControllers. SurfaceController class now inherits from PluginController which exposes all things a dev would
need including making IPublishedContentStore and IPublishedMediaStore public which can be accessed simply by properties on the controller.
Updated web.config for views to include Umbraco.Web namespace for all of our helper methods.
BeginUmbracoForm now has many more overrides for which you can specify a type or a generic type (we no longer require GUIDs :)
Instead (because we still want areas), we have an attribute called PluginControllerAttribute which allows a dev to assign an area name as a string. A package developer should always ensure that all of their plugin controllers are assigned to the same
area. This also lets us get rid of the GUID id part of the plugin (hopefully we can leave it out, just need to run some tests). Since we have areas, package devs can then put their views into
their own folders and not clutter up the local devs ~/Views folder. Perhaps we use App_Plugins/[PackageName] for the views like we did in v5 but need to ask on the mail list. Otherwise it will be the standard MVC:
~/Areas/[AreaName]/Views which will still also clutter up the local devs view folder if they are using Areas.
