Add fw dumping

- also fatfs is stupid
- also close files properly on a failed copy
- also check for errors during folder readouts
- also make sure holding vol- doesn't dump the keys anyway

source/fs/readers/folderReader.h

@@ -3,4 +3,5 @@
 #include "../../utils/vector.h"
 #include "../fstypes.h"
 
-Vector_t /* of type FSEntry_t */ ReadFolder(char *path);
+void clearFileVector(Vector_t *v);
+Vector_t /* of type FSEntry_t */ ReadFolder(char *path, int *res);