Logic unit control

core/src/mindustry/logic/LAssembler.java

@@ -21,8 +21,12 @@ public class LAssembler{
     LInstruction[] instructions;
 
     public LAssembler(){
+        //instruction counter
         putVar("@counter").value = 0;
+        //unix timestamp
         putConst("@time", 0);
+        //currently controlled unit
+        putConst("@unit", null);
 
         //add default constants
         putConst("false", 0);
@@ -45,6 +49,10 @@ public class LAssembler{
             }
         }
 
+        for(UnitType type : Vars.content.units()){
+            putConst("@" + type.name, type);
+        }
+
         //store sensor constants
 
         for(LAccess sensor : LAccess.all){