PicoC: GCS plugin for uploading and testing scripts

This adds a picoC widget to the gcs. Further more UAVObjects are available in user scripts. It also new is an access level management for writing sensible UAVObjects.
Here is a video of working: https://vimeo.com/100625857. Sorry for the poor quality, i try to upload it in HD soon.
Tested on OSX and Linux32-VM.