added projectile class and tweaked weapon uberscript

scripts/rocket.gd

@@ -1,16 +1,10 @@
-extends RigidBody3D
+extends Projectile
 
 @export var explosion : Resource
 @export var blast_radius_area : Node
 @export var radius_shape : Node
 @export var blast_radius_falloff : Resource
 
-var blast_power
-var blast_radius
-var bullet_speed
-var player_velocity
-var bullet_damage
-var player_position
 
 # Called when the node enters the scene tree for the first time.
 func _ready():