* Renamed tile.hasUnique, deprecated `Indestructable`, unique for citadels
Also refactored the consumption of (great) people out of UnitActions.
* Reworked when improvements can be build somewhere for more clarity
* Made resources improvable by multiple improvements; Offshore Platform
* Fix compatability
* WIP
* Fixed the tests, but better
* I suppose I might as well update this now that we're a version later
* start position normalization
* assignLuxuries
* City states placement
* city state normalization
* don't consider tiny islands
* also modify the other json since they are duplicated now
* Fixed tests checking for mod correctness
* Update G&K jsons to current vanilla versions
* First pass over buildings & beliefs
* First pass over nations
* First pass over eras.json
* Fully updated tech tree
* First pass over units
* Second pass over buildings -- fixed techs
* Fixed last prerequisites and row numbers of tech
* Went through the entire tech tree and moved things to their correct spot
* Fixed tests
* Added conditionals & enumified improvement stat uniques
* Enumified all the other uniques
* Fixed bug where improvemen stat icons didn't show up in tech tree & reviews