Set HBITMAP and its parameters in one call

To avoid separate calls to SetWidth/Height/Size/Depth functions after calling SetHBITMAP() use newly implemented InitFromHBITMAP() function which allows to set HBITMAP together with its parameters in one call.

src/msw/toolbar.cpp

@@ -953,7 +953,7 @@ bool wxToolBar::Realize()
         {
             hBitmap = GetHbitmapOf(bitmap);
             // don't delete this HBITMAP!
-            bitmap.SetHBITMAP(0);
+            bitmap.ResetHBITMAP();
         }
 
         if ( remapValue == Remap_Buttons )