Add readfolder();

Done by a char array, a bit storage based attribute list (only does dir or nodir for now), and an amount of how many files there are

Current limit: 250 files per folder

source/main.c

@@ -162,5 +162,6 @@ void ipl_main()
     gfx_con_init();
     display_backlight_pwm_init();
 
+    sd_mount();
     meme_main();
 }