Refactor gameplay menus into owned scenes

ui/menus/PlanningMenu.tscn

@@ -0,0 +1,63 @@
+[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/PlanningPanel.gd" id="35"]
+[ext_resource type="Script" path="res://ui/menus/PlanningMenu.gd" id="menu_script"]
+
+[node name="PlanningMenu" type="Control" groups=["modal_menus"]]
+visible = false
+mouse_filter = 2
+anchor_right = 1.0
+anchor_bottom = 1.0
+script = ExtResource("menu_script")
+
+[node name="Backdrop" type="ColorRect" parent="."]
+mouse_filter = 2
+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 = 24.0
+offset_top = 20.0
+offset_right = -200.0
+offset_bottom = 82.0
+text = "Planning Center"
+horizontal_alignment = 1
+
+[node name="Panel" type="Control" parent="."]
+mouse_filter = 2
+anchor_right = 1.0
+offset_left = 40.0
+offset_top = 120.0
+offset_right = -40.0
+offset_bottom = -180.0
+anchor_bottom = 1.0
+script = ExtResource("35")
+
+[node name="StatusLabel" type="Label" parent="."]
+mouse_filter = 2
+anchor_right = 1.0
+anchor_top = 1.0
+anchor_bottom = 1.0
+offset_left = 32.0
+offset_top = -160.0
+offset_right = -32.0
+offset_bottom = -24.0
+theme_override_font_sizes/font_size = 28
+autowrap_mode = 2
+horizontal_alignment = 1
+text = ""
+
+[node name="CloseButton" type="Control" parent="."]
+anchor_left = 1.0
+anchor_right = 1.0
+offset_left = -140.0
+offset_top = 20.0
+offset_right = -24.0
+offset_bottom = 136.0
+script = ExtResource("10")
+icon = 1
+glow_color = Color(0.62, 0.74, 0.92, 1)