Refactor gameplay menus into owned scenes

ui/menus/TransferMenu.tscn

@@ -0,0 +1,73 @@
+[gd_scene load_steps=4 format=3]
+
+[ext_resource type="Script" path="res://ui/IconButton.gd" id="10"]
+[ext_resource type="Script" path="res://ui/ResourceTransferList.gd" id="27"]
+[ext_resource type="Script" path="res://ui/menus/TransferMenu.gd" id="menu_script"]
+
+[node name="TransferMenu" type="Control" groups=["modal_menus"]]
+visible = false
+anchor_right = 1.0
+anchor_bottom = 1.0
+script = ExtResource("menu_script")
+
+[node name="Backdrop" type="ColorRect" parent="."]
+anchor_right = 1.0
+anchor_bottom = 1.0
+color = Color(0.03, 0.03, 0.08, 0.94)
+
+[node name="TitleLabel" type="Label" parent="."]
+mouse_filter = 2
+anchor_right = 1.0
+offset_left = 24
+offset_top = 36
+offset_right = -200
+offset_bottom = 166
+text = "Transfer cargo"
+horizontal_alignment = 1
+vertical_alignment = 1
+autowrap_mode = 2
+theme_override_font_sizes/font_size = 44
+
+[node name="StatusLabel" type="Label" parent="."]
+mouse_filter = 2
+anchor_right = 1.0
+offset_left = 24
+offset_top = 184
+offset_right = -24
+offset_bottom = 284
+theme_override_font_sizes/font_size = 32
+autowrap_mode = 2
+text = ""
+horizontal_alignment = 1
+
+[node name="ResourceList" type="Control" parent="."]
+mouse_filter = 2
+anchor_right = 1.0
+offset_left = 16
+offset_top = 294
+offset_right = -16
+offset_bottom = 1080
+script = ExtResource("27")
+
+[node name="CloseButton" type="Control" parent="."]
+anchor_left = 1.0
+anchor_right = 1.0
+offset_left = -172
+offset_right = -24
+offset_top = 24
+offset_bottom = 172
+script = ExtResource("10")
+icon = 1
+glow_color = Color(1, 0.78, 0.25, 1)
+
+[node name="HintLabel" type="Label" parent="."]
+mouse_filter = 2
+anchor_right = 1.0
+offset_left = 24
+offset_top = 1092
+offset_right = -24
+offset_bottom = 1150
+text = "Arrows move the selected amount from that side"
+horizontal_alignment = 1
+theme_override_colors/font_color = Color(0.55, 0.7, 0.78, 1)
+theme_override_font_sizes/font_size = 23