Removed unneeded imports + non-aggresive cosmetic changes.

- Faster compilation: forward-declare classes(@class) instead of import (#import)
Xcode project: GUI files are in a separate group.
OpenKit.h is just the file that imports all OpenKit headers.

- OpenKit logic moved to OKDirector.{h, m} (tmp name?)
OpenKit networking tasks are centralized in OKNetworker.{h, m}
Copy-paste fail.
Merge pull request #1 from manucorporat/developManu

Unneeded imports + OKDirector + OKNetworker