0.8.8: UI Polishing, Node Completion and Compatibility + Rerouting

This version adds compatibility with Blender 2.79 (UPBGE 0.2.4) as well as some UI polishing and new nodes such as material editing nodes. It also fixes a few bugs. Yay.

This one also adds rerouting. Very Yay!

HOTFIXED: Should fix problem with icons