Hotfix - v0.66.15 (New boat encounter, increased crane limit)

- Added new boat encounter and a new item
- Added visual indicator to show that houses can be stacked when building
- 'More Cranes' research is now available on the default branch
- 'More Cranes' research max level increased to 3
- Settlers now move 11% faster

Experimental Branch:
- Mechanical Bull happiness boost increased: 5 -> 15

Fixes:
- Fixed 'Pollution/s' text not translated on buildings