[SP] Add numpad 0-9 conversion to 0-9 with numlock on from MP engine.

This will mean the numbered numpad keys can only be bound to separate binds from numbers when numlock is off which is same as MP now.
But you will be able to use the numpad numbers in console/textboxes now.

code/win32/win_wndproc.cpp

@@ -249,6 +249,16 @@ static int MapKey (ulong key, word wParam)
 	extended = (key >> 24) & 1;
 	if(wParam > 0 && wParam <= VK_SCROLL)
 	{
+		// yeuch, but oh well...
+		//
+		if ( wParam >= VK_NUMPAD0 && wParam <= VK_NUMPAD9 )
+		{
+			bool bNumlockOn = !!(GetKeyState( VK_NUMLOCK ) & 1);
+			if ( bNumlockOn )
+			{
+				wParam = 0x30 + (wParam - VK_NUMPAD0);	// convert to standard 0..9
+			}
+		}
 		result = virtualKeyConvert[wParam][extended];
 	}
 	// Get the unshifted ascii code (if any)