Charge stat for Item (#4392)

* Stat.discharge, discharge

* Update Items.java

* item.discharge

* full container = somewhat more than 4 full batteries

* Stat.discharge

* stat.discharge = Discharge

* Update core/src/mindustry/type/Item.java

Co-authored-by: Antsiferov Andrew <summet.dev@gmail.com>

* removed dis

* oops

* unit zap

Co-authored-by: Antsiferov Andrew <summet.dev@gmail.com>

core/src/mindustry/content/Items.java

@@ -74,6 +74,7 @@ public class Items implements ContentList{
 
         surgeAlloy = new Item("surge-alloy", Color.valueOf("f3e979")){{
             cost = 1.2f;
+            charge = 0.75f;
         }};
 
         sporePod = new Item("spore-pod", Color.valueOf("7457ce")){{