Tank crush damage tweaks

core/src/mindustry/world/Block.java

@@ -156,6 +156,8 @@ public class Block extends UnlockableContent implements Senseable{
     public float clipSize = -1f;
     /** When placeRangeCheck is enabled, this is the range checked for enemy blocks. */
     public float placeOverlapRange = 50f;
+    /** Multiplier of damage dealt to this block by tanks. Does not apply to crawlers. */
+    public float crushDamageMultiplier = 1f;
     /** Max of timers used. */
     public int timers = 0;
     /** Cache layer. Only used for 'cached' rendering. */

core/src/mindustry/world/blocks/defense/Wall.java

@@ -36,6 +36,7 @@ public class Wall extends Block{
         buildCostMultiplier = 6f;
         canOverdrive = false;
         drawDisabled = false;
+        crushDamageMultiplier = 5f;
 
         //it's a wall of course it's supported everywhere
         envEnabled = Env.any;