Add potato mode

TODO.txt

@@ -1,5 +1,6 @@
 =========== GENERAL ==============
 
+- car shadow?
 - sound engine: probably all SFX will be procedurally generated, ok?
 - allow slowing down in air like in TM?
 - music?
@@ -7,10 +8,6 @@
     that be played by the frontend just ALL the time (maybe with the option in
     menu to just turn music off) -- simple frontends can just ignore music
 - allow car to be flipped upside down on start? with start block transform
-- make a simple rendering setting:
-  - will exclude images and only draw solid colors, let's say only 16, so that
-    memory usage is reduced, CPU rendering is relieved, executable is smaller
-    AND frontend doesn't have to use RGB565 (it can basically choose any mode).
 - camera behavior? what if car is riding upside down (on magnet) etc?
 - compile time option to choose how many maps to include (for platforms with
   lower memory)
@@ -33,6 +30,10 @@
 =========== HANDLED ==============
 
 - allow stopping car rotation in air like in Trackmania
+- make a simple rendering setting:
+  - will exclude images and only draw solid colors, let's say only 16, so that
+    memory usage is reduced, CPU rendering is relieved, executable is smaller
+    AND frontend doesn't have to use RGB565 (it can basically choose any mode).
 - drifting: passing some upper threshold on steering force should reduce
   steering friction until reaching some some lower threshold again probably
 - maybe allow some more air control, like slowing down with brakes, like in TM