Fix RegionConfig

Implement FixedRegion
Add RegionHistory.Impl

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/shared/SizedStack.java

@@ -130,6 +130,12 @@ public class SizedStack<T> {
         return size;
     }
 
+    public void clear() {
+        this.data = (T[]) new Object[this.maxSize];
+        this.head = 0;
+        this.size = 0;
+    }
+
     @Override
     public String toString() {
         final StringBuilder result = new StringBuilder("[");