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/dolphin/types.h

@@ -31,4 +31,6 @@ typedef int                 BOOL;
 
 #define NULL (0)
 
+#define INT32_MAX (0x7fffffff)
+
 #endif