Reworked the terrain tiling. 

Reworked grid rendering/blending. The grid may now also be switched on/off.

Removed custom mouse.

Reworked the unit pathfinding. Units may not pass thru each other anymore, the exceptions being unmanned static units and the repair station.

Added damage effects for varying health levels.

Added new particle based explosion effects.

Fixed a bug that allowed reinforcement of a wiped squad.

Fixed a bug where static units were not activating as expected.

Fixed a bug where the AI turn would not end after reinforcing.