Overhaul game state logic to support gameplay loop

Zennysoft.Game.Ma/src/menu/MainMenu.tscn

@@ -0,0 +1,54 @@
+[gd_scene load_steps=2 format=3 uid="uid://rfvnddfqufho"]
+
+[ext_resource type="Script" uid="uid://14b7o2c6cgry" path="res://src/menu/MainMenu.cs" id="1_y6722"]
+
+[node name="MainMenu" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_y6722")
+
+[node name="MarginContainer" type="MarginContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 0
+theme_override_constants/margin_left = 100
+theme_override_constants/margin_top = 100
+theme_override_constants/margin_right = 100
+theme_override_constants/margin_bottom = 100
+
+[node name="VBoxContainer" type="VBoxContainer" parent="MarginContainer"]
+layout_mode = 2
+size_flags_horizontal = 0
+size_flags_vertical = 0
+mouse_filter = 0
+
+[node name="NewGameButton" type="Button" parent="MarginContainer/VBoxContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+focus_neighbor_bottom = NodePath("../LoadGameButton")
+theme_override_colors/font_focus_color = Color(0.976471, 0.827451, 0, 1)
+text = "New Game"
+
+[node name="LoadGameButton" type="Button" parent="MarginContainer/VBoxContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+focus_neighbor_top = NodePath("../NewGameButton")
+focus_neighbor_bottom = NodePath("../QuitButton")
+theme_override_colors/font_focus_color = Color(0.976471, 0.827451, 0, 1)
+text = "Load Game"
+
+[node name="QuitButton" type="Button" parent="MarginContainer/VBoxContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+focus_neighbor_top = NodePath("../LoadGameButton")
+theme_override_colors/font_focus_color = Color(0.976471, 0.827451, 0, 1)
+text = "Quit
+"