Introduce 4 new functions:

- g_map.beginGhostMode(float opacity)
- g_map.endGhostMode()
- UIMap::movePixels(int x, int y)
- MapView::move(int x, int y)

src/client/uimap.h

@@ -37,6 +37,7 @@ public:
 
     void drawSelf(Fw::DrawPane drawPane);
 
+    void movePixels(int x, int y);
     bool setZoom(int zoom);
     bool zoomIn();
     bool zoomOut();