Cleans up themes and adds styles

This update does the following:
1. Removes themes from children of control node
2. Sets the dark theme to control node (MenuScreen)
3. Defines 2 styles within the 2 themes (dark and light)

So to change the theme overall, for the control node, just load the needed theme, for example:

theme=load("res://assets/ui_controlNode_light_theme.tres")

Godot/MainMenu/GodotUserInterface_Doug/bcirpg_mainMenu_20220220A/userInterface/But_ChangeScene.gd

@@ -7,7 +7,7 @@ extends Button
 #Creates param usable in the UI; and the params next to export make it string and file browser
 export(String, FILE) var next_scene_path: = ""
 
-
+var tempToggle = 0
 
 func _on_But_NewGame_button_up():
 	get_tree().change_scene(next_scene_path)

Godot/MainMenu/GodotUserInterface_Doug/bcirpg_mainMenu_20220220A/userInterface/But_ChangeScene.tscn

@@ -1,13 +1,11 @@
-[gd_scene load_steps=3 format=2]
+[gd_scene load_steps=2 format=2]
 
 [ext_resource path="res://UserInterface/But_ChangeScene.gd" type="Script" id=1]
-[ext_resource path="res://assets/ui_highContrast_but_theme.tres" type="Theme" id=2]
 
 [node name="But_ChangeScene" type="Button"]
 margin_right = 130.0
 margin_bottom = 24.0
 size_flags_vertical = 3
-theme = ExtResource( 2 )
 text = "New Game"
 script = ExtResource( 1 )
 __meta__ = {

Godot/MainMenu/GodotUserInterface_Doug/bcirpg_mainMenu_20220220A/userInterface/But_Quit.tscn

@@ -1,13 +1,11 @@
-[gd_scene load_steps=3 format=2]
+[gd_scene load_steps=2 format=2]
 
 [ext_resource path="res://UserInterface/But_Quit.gd" type="Script" id=1]
-[ext_resource path="res://assets/ui_highContrast_but_theme.tres" type="Theme" id=2]
 
 [node name="But_Quit" type="Button"]
 margin_top = 240.0
 margin_right = 179.0
 margin_bottom = 284.0
-theme = ExtResource( 2 )
 text = "Quit"
 script = ExtResource( 1 )
 __meta__ = {