Removed @solid variable

core/src/mindustry/logic/GlobalVars.java

@@ -7,7 +7,6 @@ import arc.math.*;
 import arc.struct.*;
 import arc.util.*;
 import mindustry.*;
-import mindustry.content.*;
 import mindustry.ctype.*;
 import mindustry.game.*;
 import mindustry.type.*;
@@ -116,9 +115,6 @@ public class GlobalVars{
             put("@color" + Strings.capitalize(entry.key), entry.value.toDoubleBits());
         }
 
-        //used as a special value for any environmental solid block
-        put("@solid", Blocks.stoneWall);
-
         for(UnitType type : Vars.content.units()){
             put("@" + type.name, type);
         }