game: add weapon mod system

scenes/weapons/weapon_base.gd

@@ -1,11 +1,19 @@
 class_name WeaponBase
 extends Node2D
 
+enum WeaponTag {
+	CAN_RETURN,
+	CAN_BLEED,
+}
+
 @export var attack_cd: float
 @export var attack_damage: float
 @export var attack_aoe: float
 @export var attack_duration: float
 @export var attack_range: float
+@export var attack_crit_chance: float = 0.05
+@export var tags: Array[String] = []
+@export var modifiers: Array[WeaponModBase] = []
 
 @onready var active_cd_timer: Timer = $ActiveCDTimer
 
@@ -25,6 +33,10 @@ func do_active() -> void:
 	_do_active()
 
 
+func add_mod(mod: WeaponModBase) -> void:
+	modifiers.append(mod)
+
+
 func _do_active() -> void:
 	push_error("%s does not implement do_active" % self)
 
@@ -53,3 +65,14 @@ func find_target_in_radius() -> EnemyBase:
 		):
 			closest = c
 	return closest
+
+
+func get_calculated(key: String) -> Variant:
+	return WeaponModBase.get_calculated(self, key)
+
+
+func has_property(key: String) -> bool:
+	for prop in get_property_list():
+		if prop.name == key:
+			return true
+	return false