Allow setting of prop min/max height in the actor Edit. By sanderd17.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13568 3db68df2-c116-0410-a063-a993310a9797
Backport r13563 to the older APIs and allow for empty buildable entites token list.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13569 3db68df2-c116-0410-a063-a993310a9797
Persian blacksmith building

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13570 3db68df2-c116-0410-a063-a993310a9797
Changes terrain anchoring to use faster CalcExactNormal instead of CalcNormalFixed, refs #1988, #2039

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13571 3db68df2-c116-0410-a063-a993310a9797
Fixes a build error with SDL2, refs #2041

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13572 3db68df2-c116-0410-a063-a993310a9797
Updates to the Persian civ centre model

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13573 3db68df2-c116-0410-a063-a993310a9797
Persion civic ao update

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13574 3db68df2-c116-0410-a063-a993310a9797
Pers corral and storehouse updates

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13575 3db68df2-c116-0410-a063-a993310a9797
Optimizes GetPercentMapExplored by caching explored vertices per player, patch by scroogie, fixes #2012

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13576 3db68df2-c116-0410-a063-a993310a9797
Merge remote-tracking branch 'remotes/trunk'