honor run option with a default maze of 30x30

default_args in project
Display.main()
  if argument is empty ignore it
  if file read fails, exit
add a WHEREWHAT file
extract MazeParamEditor to share it, prepare for having a GUI instead of console

WHEREWHAT

@@ -0,0 +1,12 @@
+
+java/
+
+java sources
+
+java/org/artisanlogiciel/games
+
+java sources for package org.artisanlogiciel.games respect of java directory naming convention of files
+
+java/org/artisanlogiciel/games/Main.java
+
+Main Java entry point for this program