Split Display (gui) and Maze (work), prepare for another model

- prepare for a shorter storage model without any resolution

java/org/artisanlogiciel/games/maze/MovesProvider.java

@@ -1,9 +1,13 @@
 package org.artisanlogiciel.games.maze;
 
+import org.artisanlogiciel.games.maze.model.WidthHeightProvider;
+
 /**
  * Get model represented by possible moves
  */
-public interface MovesProvider {
+public interface MovesProvider
+    extends WidthHeightProvider
+{
 
     /** return possible moves from this position */
     short getMoves(int x, int y);