m_Do_Reset: OK (#35)

* m_Do_Reset: split and (some) decomp

decompiles:
- my_OSCancelAlarmAll()
- destroyVideo()

* mDoRst::reset(): decompile, plus some supporting code

* split DVD* functions to dvd.h

* mDoRst::resetCallBack(): decompile

include/JSystem/JKernel/JKRDvdFile/JKRDvdFile.h

@@ -3,6 +3,7 @@
 
 #include "dolphin/types.h"
 #include "JSystem/JKernel/JKRFile/JKRFile.h"
+#include "dvd/dvd.h"
 #include "global.h"
 
 class DVDFileInfo;

include/JSystem/JUtility/JUTXfb/JUTXfb.h

@@ -0,0 +1,21 @@
+#ifndef __JUTILITY_JUTXFB_JUTXFB_H__
+#define __JUTILITY_JUTXFB_JUTXFB_H__
+
+#include "dolphin/types.h"
+
+class JUTXfb {
+public:
+    void clearIndex();
+private:
+    void * xfb_buffer[3];
+    bool is_xfb_allocated[3];
+    u8 padding_1;
+    s32 num_xfbs;
+    s16 active_xfb_index;
+    s16 last_drawn_xfb_index;
+    s16 next_xfb_buffer;
+    u8 padding_2[2];
+    s32 field_0x1c;
+};
+
+#endif