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/pm/source/pm_debug_monitor.hpp

@@ -27,7 +27,7 @@ enum DmntCmd_5X {
     Dmnt_Cmd_5X_AtmosphereGetProcessHandle = 65000
 };
 
-class DebugMonitorService final : IServiceObject {
+class DebugMonitorService final : public IServiceObject {
     public:
         Result dispatch(IpcParsedCommand &r, IpcCommand &out_c, u64 cmd_id, u8 *pointer_buffer, size_t pointer_buffer_size) override;
         Result handle_deferred() override;