First part of implementation of some type-specific handlers.

TODO:
- merge dwellings.json into object configs
- proper implementation of overrides for towns
- fully connect new API to RMG/H3M
- Implementation of overrides for towns
- Converted dwellings.json into new format
- Implemented "mapObject" entry in town format
- Removed capital/fort/village fields from town in favor of overrides
Bugfixing. Game seems to be working without major bugs.