add Save Text support and rework package

- move maze within package maze

java/org/artisanlogiciel/games/maze/WallsProvider.java

@@ -0,0 +1,27 @@
+package org.artisanlogiciel.games.maze;
+
+/**
+ * WallsProvider provide a Walls representation
+ **/
+public interface WallsProvider
+{
+
+    int getWidth();
+
+    int getHeight();
+
+    /**
+     * See Brick
+     * 
+     * Will set bits :
+     * 3 2 1 0
+     * (8)(4)(2)(1)
+     * ^ > v <
+     * U R D L
+     * p i o e
+     *   g w f
+     *   h n t
+     *   t
+     **/
+    short getWalls(int x, int y);
+}