Adding GW2IconFile protocol
Removing "events" API; adding documentation

Since ArenaNet has implemented the Megaserver on all maps, the "events"
API is no longer userful.

- GW2EventState protocol has been removed;
- GW2ClientEvents no longer has event-state related methods;
- GW2Kit.h removes references to event API;
- Event-state related test specs have been removed
Adding all sources in 'Misc' to podspec
Adding 'GW2Skin' protocol (incomplete)
Necessary Xcode changes