Fix buttons on OS X
Merge pull request #112 from F1ynn/OSX-fixes

Osx fixes
Fix stack smashing, QTimer threading

QTimer CAN NOT be handled from a different thread, we needed to push them to the Core's thread

Allocating a large video frame buffer on the stack is a Bad Idea(tm), this commit fixes a bad buffer overflow

Also improve our QTimer handling during calls, no need to disconnect/reconnect on call start/end, once is enough, and no need to keep them on the stack
Merge pull request #7 from tux3/master

Merge changes on upstream