* Separated out rivers and bridges into its own file with three map variants
* fixing tags
* removed extra 4 starting positions from the medium map since it only supports 8 players
* update GetUnoccupiedPoints to consider hazards with a flag
* use new utility method to fine unoccupied points and enforce map sizes
* changed up casting to make IsAllowable() more usable
* change map support for large #'s of snakes
* test square board fn
* format comment
* add whitespace
* better support large #'s of snakes on small boards
* include an intermediate xlarge size
* fix for rivers and bridges snake start positions
* update max player count, add unit test
* set player count to 12 (max for smallest size)
* fix: one of the 19x19 spawn points
* randomize snake placement at start positions
* randomly choose starts in quadrants
* fix: check that start positions are valid
* modify food placement to avoid hazards
* WIP: initial data model for new meta props
* WIP: implemented new props
* test and bug fix:
- add coverage of players and sizes
- fix unlimited map size bug
* FIX: update supported players for arcade to 6
* fix: test should be min -> max, not max->max
* Change some naming and the FixedSizes function
* update comment to reflect API changes
* improve comment clarity
* rename field for improved clarity
* change some more "map" -> "board" wording
* reorganize code
* first draft of map generator interfaces
* add explicit random interface to board helpers
* implement standard map
* rename Generator to GameMap
* allow initializing snakes separately from placing them
* add random number generator to Settings
* updates to GameMap interface
* add helpers for creating and updating BoardState with maps
