Add reverse that allow to switch interior/exterior of a labyrinth

- invert create a new labyrinth walls are path of previous.
  - grow then new labrynth is bigger, else shrink.

java/org/artisanlogiciel/games/maze/BrickCharRepr.java

@@ -0,0 +1,2 @@
+package org.artisanlogiciel.games.maze;public class BrickCharRepr {
+}