Fixing the mini-map.

Pathing fixes, improved access to the map edge sections.

- Cleared more space in town to make room for base buildings.
- Rearranged the buildings to make more space for units to move
- Converted sandbags to smaller sections.
- Added small rocks.
- Removed the obstruction from the canyon Y section
- Raised ground under the rock on the elevated Y section to allow units to move on it.

Raised up the fourth side of the map to make the outer ring accessible at only 4 points, which makes the outer ring also viable for a fun choke-point play.
Removed the AA guns.