MxMusicPresenter vtable (#184)

* MxMusicPresenter vtable

vtable+0x34 adds the current presenter to the music manager
vtable+0x38 calls destroy with the param as "FALSE"

* Update mxmusicpresenter.cpp

* Update mxmusicpresenter.cpp

---------

Co-authored-by: Christian Semmler <mail@csemmler.com>

LEGO1/mxmusicpresenter.h

@@ -4,6 +4,7 @@
 #include "mxaudiopresenter.h"
 
 // VTABLE 0x100dc9b8
+// SIZE 0x54
 class MxMusicPresenter : public MxAudioPresenter
 {
 public:
@@ -23,6 +24,9 @@ public:
   MxMusicPresenter();
   virtual ~MxMusicPresenter() override;
 
+  virtual MxResult AddToMusicManager(); // vtable+0x34
+  virtual void vtable38(); // vtable+0x38
+
 private:
   void Init();
   void Destroy(MxBool);