Various blocks added / Crater map updated / Fixed status effect bugs

core/src/io/anuke/mindustry/entities/bullet/Bullet.java

@@ -94,6 +94,10 @@ public class Bullet extends SolidEntity implements DamageTrait, ScaleTrait, Pool
         create(type, null, Team.none, x, y, angle);
     }
 
+    public Entity getOwner(){
+        return owner;
+    }
+
     public boolean collidesTiles(){
         return type.collidesTiles;
     }

core/src/io/anuke/mindustry/entities/units/types/Crawler.java

@@ -0,0 +1,6 @@
+package io.anuke.mindustry.entities.units.types;
+
+import io.anuke.mindustry.entities.units.GroundUnit;
+
+public class Crawler extends GroundUnit{
+}