Convert Atlas to infinite lazy growth

The atlas will now expand as needed for any query, but only initialise the chunk tile memory when requested

	While this may still be a pre-mature optimisation, it does simplify some code and ensures that our memory footprint stays small, for the most part

pkg/game/command_test.go

@@ -8,7 +8,7 @@ import (
 )
 
 func TestCommand_Move(t *testing.T) {
-	world := NewWorld(2, 8)
+	world := NewWorld(8)
 	a, err := world.SpawnRover()
 	assert.NoError(t, err)
 	pos := vector.Vector{