Early Access Hotfix 19

[p]Improved AI target switching, so they no longer clump up in big stacks when fighting [/p]
[p]Fixed Rebels Castle Navmesh unreachable spot on a tower[/p]
[p]Fixed Construction Editor - Buildings wouldnt build correct navmesh so units couldnt reach other correctly [/p]
[p]Fixed Units can no longer rotate in Y axis, which made it so they were rotated uphill or downhill in certain cases[/p]