More mod content support

core/src/io/anuke/mindustry/entities/bullet/ArtilleryBulletType.java

@@ -20,6 +20,10 @@ public class ArtilleryBulletType extends BasicBulletType{
         hitSound = Sounds.explosion;
     }
 
+    public ArtilleryBulletType(){
+        this(1f, 1f, "shell");
+    }
+
     @Override
     public void update(io.anuke.mindustry.entities.type.Bullet b){
         super.update(b);

core/src/io/anuke/mindustry/entities/bullet/BasicBulletType.java

@@ -22,6 +22,11 @@ public class BasicBulletType extends BulletType{
         this.bulletSprite = bulletSprite;
     }
 
+    /** For mods. */
+    public BasicBulletType(){
+        this(1f, 1f, "bullet");
+    }
+
     @Override
     public void load(){
         backRegion = Core.atlas.find(bulletSprite + "-back");

core/src/io/anuke/mindustry/entities/bullet/BombBulletType.java

@@ -17,4 +17,8 @@ public class BombBulletType extends BasicBulletType{
         collidesAir = false;
         hitSound = Sounds.explosion;
     }
+
+    public BombBulletType(){
+        this(1f, 1f, "shell");
+    }
 }

core/src/io/anuke/mindustry/entities/bullet/FlakBulletType.java

@@ -19,6 +19,10 @@ public abstract class FlakBulletType extends BasicBulletType{
         bulletHeight = 10f;
     }
 
+    public FlakBulletType(){
+        this(1f, 1f);
+    }
+
     @Override
     public void update(Bullet b){
         super.update(b);

core/src/io/anuke/mindustry/entities/bullet/HealBulletType.java

@@ -22,6 +22,10 @@ public class HealBulletType extends BulletType{
         collidesTeam = true;
     }
 
+    public HealBulletType(){
+        this(1f, 1f);
+    }
+
     @Override
     public boolean collides(Bullet b, Tile tile){
         return tile.getTeam() != b.getTeam() || tile.entity.healthf() < 1f;

core/src/io/anuke/mindustry/entities/bullet/LiquidBulletType.java

@@ -3,6 +3,7 @@ package io.anuke.mindustry.entities.bullet;
 import io.anuke.arc.graphics.*;
 import io.anuke.arc.graphics.g2d.*;
 import io.anuke.arc.math.geom.*;
+import io.anuke.arc.util.ArcAnnotate.*;
 import io.anuke.mindustry.content.*;
 import io.anuke.mindustry.entities.*;
 import io.anuke.mindustry.entities.effect.*;
@@ -13,14 +14,17 @@ import io.anuke.mindustry.world.*;
 import static io.anuke.mindustry.Vars.*;
 
 public class LiquidBulletType extends BulletType{
-    Liquid liquid;
+    @NonNull Liquid liquid;
 
-    public LiquidBulletType(Liquid liquid){
+    public LiquidBulletType(@Nullable Liquid liquid){
         super(3.5f, 0);
-        this.liquid = liquid;
+
+        if(liquid != null){
+            this.liquid = liquid;
+            this.status = liquid.effect;
+        }
 
         lifetime = 74f;
-        status = liquid.effect;
         statusDuration = 90f;
         despawnEffect = Fx.none;
         hitEffect = Fx.hitLiquid;
@@ -30,13 +34,17 @@ public class LiquidBulletType extends BulletType{
         knockback = 0.55f;
     }
 
+    public LiquidBulletType(){
+        this(null);
+    }
+
     @Override
     public float range(){
         return speed * lifetime / 2f;
     }
 
     @Override
-    public void update(io.anuke.mindustry.entities.type.Bullet b){
+    public void update(Bullet b){
         super.update(b);
 
         if(liquid.canExtinguish()){
@@ -50,7 +58,7 @@ public class LiquidBulletType extends BulletType{
     }
 
     @Override
-    public void draw(io.anuke.mindustry.entities.type.Bullet b){
+    public void draw(Bullet b){
         Draw.color(liquid.color, Color.white, b.fout() / 100f);
 
         Fill.circle(b.x, b.y, 0.5f + b.fout() * 2.5f);

core/src/io/anuke/mindustry/entities/bullet/MissileBulletType.java

@@ -23,6 +23,10 @@ public class MissileBulletType extends BasicBulletType{
         hitSound = Sounds.explosion;
     }
 
+    public MissileBulletType(){
+        this(1f, 1f, "missile");
+    }
+
     @Override
     public void update(Bullet b){
         super.update(b);