Implemented ground mech boosting

core/src/mindustry/entities/comp/ChildComp.java

@@ -0,0 +1,29 @@
+package mindustry.entities.comp;
+
+import arc.util.ArcAnnotate.*;
+import mindustry.annotations.Annotations.*;
+import mindustry.gen.*;
+
+@Component
+abstract class ChildComp implements Posc{
+    @Import float x, y;
+
+    @Nullable Posc parent;
+    float offsetX, offsetY;
+
+    @Override
+    public void add(){
+        if(parent != null){
+            offsetX = x - parent.getX();
+            offsetY = y - parent.getY();
+        }
+    }
+
+    @Override
+    public void update(){
+        if(parent != null){
+            x = parent.getX() + offsetX;
+            y = parent.getY() + offsetY;
+        }
+    }
+}