refactor(xan): Switch to V2 over tuples most places

These are generally rather nicer to work due to some typeclass instances,
and integrate better with other ecosystems for things like linear
algebra etc.

Change-Id: I546c8da7b17234648f3d612b28741c1fded25447
Reviewed-on: https://cl.tvl.fyi/c/depot/+/910
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>

users/glittershark/xanthous/src/Xanthous/Generators/CaveAutomata.hs

@@ -19,6 +19,7 @@ import           Xanthous.Util (between)
 import           Xanthous.Util.Optparse
 import           Xanthous.Data (Dimensions, width, height)
 import           Xanthous.Generators.Util
+import           Linear.V2
 --------------------------------------------------------------------------------
 
 data Params = Params
@@ -102,7 +103,7 @@ generate' params dims = do
 stepAutomata :: forall s g. MCells s -> Dimensions -> Params -> CellM g s ()
 stepAutomata cells dims params = do
   origCells <- lift $ cloneMArray @_ @(STUArray s) cells
-  for_ (range ((0, 0), (dims ^. width, dims ^. height))) $ \pos -> do
+  for_ (range (0, V2 (dims ^. width) (dims ^. height))) $ \pos -> do
     neighs <- lift $ numAliveNeighborsM origCells pos
     origValue <- lift $ readArray origCells pos
     lift . writeArray cells pos