GatherSugarBehavior: Correctly handle "dead" targets

Signed-off-by: Uli Schlachter <psychon@znc.in>
GameMap: Improve handling of dead sugar sources

Signed-off-by: Uli Schlachter <psychon@znc.in>
Ameisenbaer: Create more kinds of Ants

Signed-off-by: Uli Schlachter <psychon@znc.in>
Make weak ants follow stronger ones and make groups attack enemies

Signed-off-by: Uli Schlachter <psychon@znc.in>
ameisenbar: Make HillAI more intelligent in creating Ants

Signed-off-by: Uli Schlachter <psychon@znc.in>
Tweak attack and defense behavior

Signed-off-by: Uli Schlachter <psychon@znc.in>
Camp in enemy base if nothing better to do

Signed-off-by: Uli Schlachter <psychon@znc.in>