Add generator buffs (additional test required)

generator_buff_tile.tscn

@@ -0,0 +1,41 @@
+[gd_scene format=3 uid="uid://g1w168ancuxi"]
+
+[ext_resource type="Script" uid="uid://bsu10r1nhmhw1" path="res://generator_buff_tile.gd" id="1_wdw66"]
+
+[node name="GeneratorBuffTile" type="HBoxContainer" unique_id=50960329]
+size_flags_horizontal = 3
+theme_override_constants/separation = 8
+script = ExtResource("1_wdw66")
+
+[node name="Icon" type="TextureRect" parent="." unique_id=1130513269]
+visible = false
+custom_minimum_size = Vector2(18, 18)
+layout_mode = 2
+stretch_mode = 5
+
+[node name="TextLabel" type="Label" parent="." unique_id=2066010368]
+custom_minimum_size = Vector2(140, 0)
+layout_mode = 2
+text = "Buff"
+
+[node name="LevelLabel" type="Label" parent="." unique_id=1101640559]
+custom_minimum_size = Vector2(50, 0)
+layout_mode = 2
+text = "Lv 0"
+
+[node name="EffectLabel" type="Label" parent="." unique_id=976763452]
+custom_minimum_size = Vector2(90, 0)
+layout_mode = 2
+text = "x1.00"
+
+[node name="CostLabel" type="Label" parent="." unique_id=246779202]
+layout_mode = 2
+size_flags_horizontal = 3
+text = "0"
+
+[node name="BuyButton" type="Button" parent="." unique_id=1815270585]
+custom_minimum_size = Vector2(68, 0)
+layout_mode = 2
+text = "Buy"
+
+[connection signal="pressed" from="BuyButton" to="." method="_on_buy_button_pressed"]