more battles animations:
- UI will be correctly greyed-out during opponent turn
- fixed remaining issues with blit order
- a bit better handling of catapult attack
- fixes #1362

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3456 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834