increase game speed with keydown

src/tc_settings.c

@@ -1,5 +1,7 @@
 #include "tc_settings.h"
 
+#define DEFAULT_GAME_SPEED 50
+
 int game_speed_setting = 50;
 int target_fps_setting = 60;
 
@@ -8,3 +10,5 @@ struct TC_Setting *tc_settings;
 void TC_Set_Game_Speed(int speed) { game_speed_setting = speed; }
 
 void TC_Set_Target_Fps(int fps) { target_fps_setting = fps; }
+
+void TC_Reset_Game_Speed(void) { game_speed_setting = DEFAULT_GAME_SPEED; }