Add X11 frontend

TODO.txt

@@ -11,13 +11,8 @@ fuck issue trackers :D
   - Nibble, should hopefully be powerful enough.
   - ESPboy?
   - linux framebuffer?
-- make car turned on its back behave nicer? but how?
 - press forward map??? :-D only when physics is frozen
 - make some kinda repo for world record runs? how will they submit it?
-- Try doing the bouncy car body? Just keep a point and its velocity, change
-  its velocity by a proportion of car's velocity change (this minus prev.
-  frame), then offset car body by this. However we'll also have to transform
-  inbetween world space and model space.
 - final tests:
   - very long replay
   - different resolutions
@@ -43,6 +38,11 @@ fuck issue trackers :D
 =========== HANDLED ==============
 
 - should drifting make a sound? NO NEED
+- make car turned on its back behave nicer? but how? PROLLY NOT
+- Try doing the bouncy car body? Just keep a point and its velocity, change
+  its velocity by a proportion of car's velocity change (this minus prev.
+  frame), then offset car body by this. However we'll also have to transform
+  inbetween world space and model space. LEAVE FOR A MOD
 - add display of inputs on the screen (option in setting? arg?)
 - viewing replay during countdown bugs!
 - sometimes after restart the timer shows not 0:0:0, but something like 0:0:033