Supporting items for SetupCopyRect() (#177)

* Minor improvements all related to SetupCopyRect

* Rename inline getters. malloc/free -> new/delete

* MxTypes in TransitionManager. Remove stub marker (oops)

LEGO1/mxbitmap.h

@@ -25,6 +25,8 @@ struct MxBITMAPINFO {
 #define LOWCOLOR 0 // 256 color
 #define HIGHCOLOR 1 // High Color (16-bit)
 
+// SIZE 0x20
+// VTABLE 0x100dc7b0
 class MxBitmap : public MxCore
 {
 public:
@@ -44,6 +46,8 @@ public:
   virtual MxResult SetBitDepth(MxBool); // vtable+3c
   virtual MxResult StretchBits(HDC p_hdc, int p_xSrc, int p_ySrc, int p_xDest, int p_yDest, int p_destWidth, int p_destHeight); // vtable+40
 
+  inline BITMAPINFOHEADER *GetBmiHeader() const { return m_bmiHeader; }
+
 private:
   MxResult ImportColorsToPalette(RGBQUAD*, MxPalette*);