added projectile class and tweaked weapon uberscript

scripts/shotgun_pellet.gd

@@ -1,4 +1,4 @@
-extends RigidBody3D
+extends Projectile
 
 @export var max_bounces : int = 10
 
@@ -6,11 +6,6 @@ extends RigidBody3D
 @onready var mesh: MeshInstance3D = $MeshInstance3D
 @onready var material = mesh.get_surface_override_material(0)
 
-var bullet_speed
-var player_velocity
-var bullet_force_mod
-var bullet_damage
-var player_position
 var bounces = 0
 var start_time
 var end_time