Update weapon resources, default weapon loaded; implemented call weapon

by name.

scripts/weapon_shot.gd

@@ -0,0 +1,17 @@
+class_name WeaponShot
+extends Resource
+
+@export_category("Info")
+@export var shot_name: String
+@export var bullet_scene: PackedScene = null
+
+@export_category("Shot Data")
+@export var damage: int = 1
+@export var speed: int = 135
+@export var projectiles: int = 2
+@export var spacing: float = 35
+@export var origin: int = -23
+
+@export_category("Spread")
+@export var horizontal_offset: float = 6.5  # Horizontal distance between projectiles
+@export var stagger_offset: float = 0.1  # Time delay per projectile index