Update #6

Managed to make another map (level 6). This time you are given a group of tier 2 and little anything else. You must establish an advantage over your opponent quickly before they manage to take over rest of the map them selves.

Other notable changes:
- turret building preview allowed construction on unpathable terrain which resulted in turret jumping to nearest pathable place. Now preview also checks the spot for being walkable.
- a friend of mine complained that camera should be locked while trying to select groups of units while holding down mouse and so I did
- also added standard rts feature of sellecting all units of the same type by double clicking
- added anti-air tank. Basicly worse wersion of anti-air turret in terms of damage but only its mobile and its free :)