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/keys/nca.h

@@ -0,0 +1,12 @@
+#pragma once
+
+enum NcaTypes {
+    Porgram = 0,
+    Meta,
+    Control,
+    Manual,
+    Data,
+    PublicData
+};
+
+int GetNcaType(char *path);