fat_io_lib finally works, implement virtual partition devices, manage devices via string keys

init/init.c

@@ -20,7 +20,7 @@ void receiver (void) {
 }
 
 void app_main (void) {
-  int ce_pid = exec ("ramdisk", "ce");
+  int ce_pid = exec ("RD", "ce");
   ce_pgid = get_procgroup (ce_pid);
 
   process_spawn (&receiver, NULL);