Added some Level 5 implementation and reorganized file structure

GUI/Inventory Menu.tscn

@@ -0,0 +1,41 @@
+[gd_scene format=2]
+
+[node name="Inventory Menu" type="Node"]
+
+[node name="CenterContainer" type="CenterContainer" parent="."]
+rect_min_size = Vector2( 320, 180 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="VBoxContainer" type="VBoxContainer" parent="CenterContainer"]
+margin_left = 53.0
+margin_top = 78.0
+margin_right = 266.0
+margin_bottom = 102.0
+
+[node name="HBoxContainer" type="HBoxContainer" parent="CenterContainer/VBoxContainer"]
+margin_right = 213.0
+margin_bottom = 20.0
+
+[node name="Button" type="Button" parent="CenterContainer/VBoxContainer/HBoxContainer"]
+margin_right = 71.0
+margin_bottom = 20.0
+text = "Weapons"
+
+[node name="Button2" type="Button" parent="CenterContainer/VBoxContainer/HBoxContainer"]
+margin_left = 75.0
+margin_right = 164.0
+margin_bottom = 20.0
+text = "Accessories"
+
+[node name="Button3" type="Button" parent="CenterContainer/VBoxContainer/HBoxContainer"]
+margin_left = 168.0
+margin_right = 213.0
+margin_bottom = 20.0
+text = "Skills"
+
+[node name="VBoxContainer" type="VBoxContainer" parent="CenterContainer/VBoxContainer"]
+margin_top = 24.0
+margin_right = 213.0
+margin_bottom = 24.0