0.76 -> 0.77
- Scientist workers implemented.
- Road, tram and grass variants added to slope block.
- Minor optimizations in city load code and calculation and connectivity managers.
- New happiness system.
- New sanctuary building added.

- Fixed issue with placing trams on slanted blocks etc.
- Fixed avenue road tile not being replaced when placing trams.

Added, but enabled later (when ideology system is finished)
- Center of tradition.
- Grand library
- Great museum of history