added endless mode support to the wave viewer

Towers/Gatling/tower_stats.tres

@@ -1,6 +1,7 @@
 [gd_resource type="Resource" script_class="CardText" format=3 uid="uid://nxl5wabgl36t"]
 
 [ext_resource type="Script" uid="uid://bsuinotkvh7eu" path="res://Scripts/Resources/feature.gd" id="1_5mpl7"]
+[ext_resource type="Resource" uid="uid://dfup264h2pun7" path="res://Scripts/Features/HeavyRounds/heavy_rounds_feature.tres" id="2_is2l1"]
 [ext_resource type="Script" uid="uid://dg7gxxqfqxcmc" path="res://Scripts/Resources/card_text.gd" id="2_ky46y"]
 
 [resource]
@@ -13,4 +14,5 @@ attributes = Dictionary[String, float]({
 "Speed Multiplier": 2.0,
 "Speed Time": 3.0
 })
+features = Array[ExtResource("1_5mpl7")]([ExtResource("2_is2l1")])
 text = "DESC_TOWER_ACCEL"