more ext improvements

add NPC,withID
add NPC.withName
add Projectile.withID
add Scene.projectilesWithID

use HashSet instead of ArrayList to prevent objects bigger than 1x1 from being in the Scene.objects list twice. it also improves performance.

runelite-api/src/main/java/net/runelite/api/NPC.java → runelite-api/src/main/java/net/runelite/api/NPC.kt

@@ -22,56 +22,46 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-package net.runelite.api;
-
-import javax.annotation.Nullable;
+package net.runelite.api
 
 /**
  * Represents a non-player character in the game.
  */
-public interface NPC extends Actor
-{
-	/**
-	 * Gets the ID of the NPC.
-	 *
-	 * @return the ID of the NPC
-	 * @see NpcID
-	 */
-	int getId();
-
-	@Override
-	String getName();
-
-	@Override
-	int getCombatLevel();
-
-	/**
-	 * Gets the index position of this NPC in the clients cached
-	 * NPC array.
-	 *
-	 * @return the NPC index
-	 * @see Client#getCachedNPCs()
-	 */
-	int getIndex();
+interface NPC : Actor {
+    /**
+     * Gets the ID of the NPC.
+     *
+     * @return the ID of the NPC
+     * @see NpcID
+     */
+    val id: Int
+    override fun getName(): String?
+    override fun getCombatLevel(): Int
 
-	/**
-	 * Gets the composition of this NPC.
-	 *
-	 * @return the composition
-	 */
-	NPCComposition getComposition();
+    /**
+     * Gets the index position of this NPC in the clients cached
+     * NPC array.
+     *
+     * @return the NPC index
+     * @see Client.getCachedNPCs
+     */
+    val index: Int
 
-	/**
-	 * Get the composition for this NPC and transform it if required
-	 *
-	 * @return the transformed NPC
-	 */
-	@Nullable
-	NPCComposition getTransformedComposition();
+    /**
+     * Gets the composition of this NPC.
+     *
+     * @return the composition
+     */
+    val composition: NPCComposition
 
-	@Nullable
-	NpcOverrides getModelOverrides();
+    /**
+     * Get the composition for this NPC and transform it if required
+     *
+     * @return the transformed NPC
+     */
+    val transformedComposition: NPCComposition?
+    val modelOverrides: NpcOverrides?
+    val chatheadOverrides: NpcOverrides?
 
-	@Nullable
-	NpcOverrides getChatheadOverrides();
+    companion object
 }