load .we with layers

- and fix some bug : max is within range ( perhaps not as many as those added ...)
- quick hack in CharProvider to skip spaces ... ( bad it applies to strings too ...)

java/org/artisanlogiciel/games/minetest/Range.java

@@ -33,7 +33,7 @@ public class Range {
         return update;
     }
 
-    boolean updateBounds(int v)
+    protected boolean updateBounds(int v)
     {
         boolean update = false;
 
@@ -65,7 +65,7 @@ public class Range {
         }
         else
         {
-            return max - min;
+            return max - min + 1;
         }
     }
 }