Fix units that can't be hit being hit by some things. (#7391)

* Hittable check in checkTarget

* Remove hittable() and checkTarget() overlap

* Make PointBulletType abide collision types

There should probably be a thing for jsonable `buildingFilter`s, in the case that you want something that doesn't target blocks.

* PointBulletTypes should not be reflectable

* oop

* Use targettable instead of hittable

* targetable check for Damage#linecast

* targetable check for defenderAI

* I shot, and then I hit something, but it was some invisible thing in the way, so I guess I missed

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

@@ -30,7 +30,7 @@ public class FlakBulletType extends BasicBulletType{
         if(b.time >= flakDelay && b.fdata >= 0 && b.timer(2, flakInterval)){
             Units.nearbyEnemies(b.team, Tmp.r1.setSize(explodeRange * 2f).setCenter(b.x, b.y), unit -> {
                 //fdata < 0 means it's primed to explode
-                if(b.fdata < 0f || !unit.checkTarget(collidesAir, collidesGround) || !unit.type.targetable) return;
+                if(b.fdata < 0f || !unit.checkTarget(collidesAir, collidesGround) || !unit.targetable(b.team)) return;
 
                 if(unit.within(b, explodeRange + unit.hitSize/2f)){
                     //mark as primed

core/src/mindustry/entities/bullet/PointBulletType.java

@@ -16,6 +16,7 @@ public class PointBulletType extends BulletType{
          scaleLife = true;
          lifetime = 100f;
          collides = false;
+         reflectable = false;
          keepVelocity = false;
          backMove = false;
      }
@@ -42,7 +43,7 @@ public class PointBulletType extends BulletType{
         float range = 1f;
 
         Units.nearbyEnemies(b.team, px - range, py - range, range*2f, range*2f, e -> {
-            if(e.dead()) return;
+            if(e.dead() || !e.checkTarget(collidesAir, collidesGround) || !e.hittable()) return;
 
             e.hitbox(Tmp.r1);
             if(!Tmp.r1.contains(px, py)) return;
@@ -56,7 +57,7 @@ public class PointBulletType extends BulletType{
 
         if(result != null){
             b.collision(result, px, py);
-        }else{
+        }else if(collidesTiles){
             Building build = Vars.world.buildWorld(px, py);
             if(build != null && build.team != b.team){
                 build.collision(b);