- removed hardcoded set of catapult trajectories
- some more improvements into projectile blitting

Remaining issues:
- timing is off when catapult hits walls/tower
- catapult trajectory may need tweaking

git-svn-id: https://vcmi.svn.sourceforge.net/svnroot/vcmi/trunk@3307 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834