A bit more text-related work:
- credits screen will use multi-line label instead of hackish usage of text box
- campaign intro movie player now plays voiced intro
- minor fixes to last commit

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3519 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834