Add key repeat

TODO.txt

@@ -2,7 +2,6 @@ fuck issue trackers :D
 
 =========== GENERAL ==============
 
-- menu: key repeat?
 - controller supports? analog input could be "tapping" the keys with varying
   frequency
 - frontends:
@@ -45,6 +44,7 @@ fuck issue trackers :D
 =========== HANDLED ==============
 
 - should drifting make a sound? NO NEED
+- menu: key repeat?
 - replay validation? maybe yes?
 - ghost color
 - make reverse maps

game.h

@@ -1366,6 +1366,17 @@ void LCR_gameSaveReplay(void)
   LCR_gamePopupMessage(LCR_texts[LCR_TEXTS_SAVED]);
 }
 
+/**
+  Checks if given key is either immediately pressed or repeated after being
+  held for some time.
+*/
+uint8_t LCR_gameKeyActive(uint8_t key)
+{
+  return LCR_game.keyStates[key] == 1 ||
+    (LCR_game.keyStates[key] >= (1200 / LCR_SETTING_FPS)
+      && ((LCR_game.frame & 0x03) == 0));
+}
+
 /**
   Helper subroutine, handles user input during main loop frame, EXCEPT for the
   driving input (that is handled in the loop itself).
@@ -1470,7 +1481,7 @@ void LCR_gameHandleInput(void)
       LCR_game.menu.selectedItem = 0;
       LCR_audioPlaySound(LCR_SOUND_CLICK);
     }
-    else if (LCR_game.keyStates[LCR_KEY_UP] == 1)
+    else if (LCR_gameKeyActive(LCR_KEY_UP))
     {
       LCR_LOG1("menu item up");
 
@@ -1487,7 +1498,7 @@ void LCR_gameHandleInput(void)
         scrolled = -1;
       }
     }
-    else if (LCR_game.keyStates[LCR_KEY_DOWN] == 1)
+    else if (LCR_gameKeyActive(LCR_KEY_DOWN))
     {
       LCR_LOG1("menu item down");