- Implemented serialization of Goals. Loaded games work, at least.
- Attempts to add Subterranean Gates to SectorMap
- Extensive use of ClearWayTo goal.

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3762 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834