Extended building dependencies:
- buiding/structure lists must use object format. This may break some
outdated mods.
- generic support for logical expressions that consist from and/or/not
operators.
- string ID's for buidings are now actually used.


git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3636 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834