Implemented ground mech boosting

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

@@ -0,0 +1,50 @@
+package mindustry.entities.comp;
+
+import arc.util.*;
+import mindustry.annotations.Annotations.*;
+import mindustry.content.*;
+import mindustry.gen.*;
+
+@Component
+abstract class ShieldComp implements Healthc, Posc{
+    @Import float health, hitTime;
+    @Import boolean dead;
+
+    /** Absorbs health damage. */
+    float shield;
+    /** Shield opacity. */
+    transient float shieldAlpha = 0f;
+
+    @Replace
+    @Override
+    public void damage(float amount){
+        hitTime = 1f;
+
+        boolean hadShields = shield > 0.0001f;
+
+        if(hadShields){
+            shieldAlpha = 1f;
+        }
+
+        float shieldDamage = Math.min(shield, amount);
+        shield -= shieldDamage;
+        amount -= shieldDamage;
+
+        if(amount > 0){
+            health -= amount;
+            if(health <= 0 && !dead){
+                kill();
+            }
+
+            if(hadShields && shield <= 0.0001f){
+                Fx.unitShieldBreak.at(x(), y(), 0, this);
+            }
+        }
+    }
+
+    @Override
+    public void update(){
+        shieldAlpha -= Time.delta() / 15f;
+        if(shieldAlpha < 0) shieldAlpha = 0f;
+    }
+}