v2.28.13 BETA

- Reenabled the gate checker code
- Modified the mouseMovedOrUp-Method in the GuiBrainLogicBlock class so
that it gets triggered when the mouse moves
- Some formatting in the Gate class
- Added some function descriptions in the Gate class
- Added a new function which is called when the Gate changes or the
Block gets placed (called onGateChange)
- Added first gate for testing