fs.mitm: WIP LayeredFS impl (NOTE: UNUSABLE ATM)

Also greatly refactors libstratosphere, and does a lot of other things.
There is a lot of code in this one.

stratosphere/fs_mitm/source/debug.cpp

@@ -1,17 +1,14 @@
 #include <switch.h>
+#include <stratosphere.hpp>
 #include <cstring>
 #include "debug.hpp"
 
-static u64 g_num_logged = 0;
-
-#define MAX_LOGS U64_MAX
-
 void Reboot() {
-    while (1) {
-        /* ... */
-    }
+    /* ... */
 }
 
 void Log(const void *data, int size) {
+    (void)(data);
+    (void)(size);
     /* ... */
 }