Massive removal of old UI code:

Easy accessors added FView and FControl to various components throughout UI.
Mishmash of methods in "Display" interface attached as appropriate to singletons.
AllZone updated to remove display and one or two others in favor of singletons, for future deprecation.
Some renaming for consistency.
Skins folder moved out of "images", which will be deprecated soon.
FControl refactored to reuse single instance of each UI state.

src/test/java/forge/GuiMultipleBlockers4Test.java

@@ -20,7 +20,7 @@ public class GuiMultipleBlockers4Test {
         list.add(AllZone.getCardFactory().getCard("Frostling", null));
 
         for (int i = 0; i < 2; i++) {
-            new GuiMultipleBlockers(null, list, i + 1, null);
+            new GuiMultipleBlockers(null, list, i + 1);
         }
     }
 }