Siege: TNT destroys soft blocks.

During a siege, TNT may destroy soft blocks regardless of surface
explosion rules.

src/me/ryanhamshire/GriefPrevention/EntityEventHandler.java

@@ -268,6 +268,25 @@ public class EntityEventHandler implements Listener
                 continue;
             }
             
+            //if claim is under siege, allow soft blocks to be destroyed
+            if(claim != null && claim.siegeData != null)
+            {
+                Material material = block.getType();
+                boolean breakable = false;
+                for(int j = 0; j < GriefPrevention.instance.config_siege_blocks.size(); j++)
+                {
+                    Material breakableMaterial = GriefPrevention.instance.config_siege_blocks.get(j);
+                    if(breakableMaterial == material)
+                    {
+                        breakable = true;
+                        explodedBlocks.add(block);
+                        break;
+                    }
+                }
+
+                if(breakable) continue;
+            }
+            
             //if no, then also consider surface rules
             if(claim == null)
             {