the huge refactor

maps/start.toml

@@ -191,7 +191,7 @@ width = 60
 height = 25
 # A single procedural grass floor across the whole board (the old mixed
 # grass/dirt/stone/water floor is not representable with one floor attribute).
-floor = { generator = "grass" }
+floor = { biome = "grass" }
 
 # The single grid: all solids and most non-solids (terrain, the player, objects and
 # the portal). A space is always a transparent empty cell, so the floor shows through.