Basic AI functionality implemented. Now targets first located unit on graph if one can be found, otherwise either moves randomly (if marked as Offensive, default) or stands still (if defensive).

Signed-off-by: Ken 'Minalien' Murray <minalien@gmail.com>
Merge pull request #149 from Minalien/master

Basic AI functionality implemented. Now targets first located unit on gr...
Merge branch 'master' of https://github.com/Tactibru/Game
Level 11 done. Added HUD to level 2.