0024186: Eliminate remaining compiler warnings in MSVC++ 2010 64 bit with warning level 4

Eliminated some warnings of type C4267 (conversion from Type1 to Type2: possible loss of data); size_t to int explicit casts added.
Fixed warning C4267 and 4244 in OSD* files

Change in OSD_FileNode and OSD_File reverted since different handle types are needed on Unix and Windows

src/InterfaceGraphic/InterfaceGraphic_Palette.c

@@ -132,7 +132,10 @@ __declspec( dllexport ) long InterfaceGraphic_RealizePalette ( HDC hdc, HPALETTE
   
   }  // end else
  
+#pragma warning(push)
+#pragma warning(disable:4306) /* level 4 warning on cast of int to HWND in HWND_BROADCAST macro */
   PostMessage ( HWND_BROADCAST, WM_SYSCOLORCHANGE, 0, 0 );
+#pragma warning(pop)
 
  } else {