Add laser sound effect and implement BigLaser bullet behavior

- Added laserbig.ogg sound effect import configuration.
- Created BigLaser script extending BulletBase with AI targeting and dot application functionality.

scripts/Contents/Bullets/BigLaser.gd

@@ -0,0 +1,12 @@
+extends BulletBase
+class_name BigLaser
+
+func ai():
+	rotation = (get_global_mouse_position() - position).angle()
+	position = launcher.texture.global_position
+func applyDot():
+	hitbox.disabled = true
+	await TickTool.millseconds(50)
+	hitbox.disabled = false
+	await TickTool.millseconds(50)
+	return true