Implement LegoSoundManager (#521)

* push code

* begin work on subclass

* fixes

* Fixes

---------

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

LEGO1/lego/legoomni/include/legounknown100d6b4c.h

@@ -2,6 +2,7 @@
 #define LEGOUNKNOWN100D6B4C_H
 
 #include "decomp.h"
+#include "mxtypes.h"
 
 class LegoCacheSound;
 
@@ -9,7 +10,15 @@ class LegoCacheSound;
 // SIZE 0x20
 class LegoUnknown100d6b4c {
 public:
+	LegoUnknown100d6b4c();
+	~LegoUnknown100d6b4c();
+
+	virtual MxResult Tickle(); // vtable+0x00
+
 	void FUN_1003dc40(LegoCacheSound** p_und);
+
+private:
+	undefined m_pad[0x1c];
 };
 
 #endif // LEGOUNKNOWN100D6B4C_H