Replaced custom windows with Godot's native ones

- Got rid of my custom windows for Godot's because I forgot the engine had those, for some reason. ¯\_(ツ)_/¯ Oh well, at least it frees up a lot of unnecessary baggage and stress. Everything else is pretty much the same, aside from that.

project/Shell.tscn

@@ -1,6 +1,6 @@
 [gd_scene format=2]
 
-[node name="Shell" type="Control"]
+[node name="Shell" type="Control" index="0"]
 
 anchor_left = 0.0
 anchor_top = 0.0
@@ -15,7 +15,61 @@ mouse_default_cursor_shape = 0
 size_flags_horizontal = 1
 size_flags_vertical = 1
 
-[node name="RefRect" type="ReferenceRect" parent="." index="0"]
+[node name="HelpWin" type="WindowDialog" parent="." index="0"]
+
+visible = false
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = 183.0
+margin_top = 124.0
+margin_right = 373.0
+margin_bottom = 198.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 1
+popup_exclusive = false
+window_title = "KHELP"
+resizable = false
+
+[node name="HelpTxt" type="RichTextLabel" parent="HelpWin" index="1"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_top = 4.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = true
+focus_mode = 2
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 1
+bbcode_enabled = true
+bbcode_text = "[center]help - Shows this window
+lang en - Use English
+lang sv - Use Swedish
+close - Closes the shell[/center]"
+visible_characters = -1
+percent_visible = 1.0
+meta_underlined = true
+tab_size = 4
+text = "help - Shows this window
+lang en - Use English
+lang sv - Use Swedish
+close - Closes the shell"
+scroll_active = true
+scroll_following = false
+selection_enabled = true
+override_selected_font_color = false
+_sections_unfolded = [ "BBCode" ]
+
+[node name="RefRect" type="ReferenceRect" parent="." index="1"]
 
 anchor_left = 0.0
 anchor_top = 0.0
@@ -32,7 +86,7 @@ mouse_default_cursor_shape = 0
 size_flags_horizontal = 1
 size_flags_vertical = 1
 
-[node name="HSplit" type="HSplitContainer" parent="RefRect" index="0"]
+[node name="CmdLine" type="LineEdit" parent="RefRect" index="0"]
 
 anchor_left = 0.0
 anchor_top = 0.0
@@ -44,24 +98,6 @@ margin_right = 288.0
 margin_bottom = 30.0
 rect_pivot_offset = Vector2( 0, 0 )
 rect_clip_content = false
-mouse_filter = 0
-mouse_default_cursor_shape = 0
-size_flags_horizontal = 1
-size_flags_vertical = 1
-split_offset = 165
-collapsed = false
-dragger_visibility = 0
-
-[node name="CmdLine" type="LineEdit" parent="RefRect/HSplit" index="0"]
-
-anchor_left = 0.0
-anchor_top = 0.0
-anchor_right = 0.0
-anchor_bottom = 0.0
-margin_right = 223.0
-margin_bottom = 24.0
-rect_pivot_offset = Vector2( 0, 0 )
-rect_clip_content = false
 focus_mode = 2
 mouse_filter = 0
 mouse_default_cursor_shape = 1
@@ -76,28 +112,4 @@ caret_blink_speed = 0.65
 caret_position = 0
 _sections_unfolded = [ "Caret" ]
 
-[node name="ExitBtn" type="Button" parent="RefRect/HSplit" index="1"]
-
-anchor_left = 0.0
-anchor_top = 0.0
-anchor_right = 0.0
-anchor_bottom = 0.0
-margin_left = 235.0
-margin_right = 282.0
-margin_bottom = 24.0
-rect_pivot_offset = Vector2( 0, 0 )
-rect_clip_content = false
-focus_mode = 2
-mouse_filter = 0
-mouse_default_cursor_shape = 0
-size_flags_horizontal = 1
-size_flags_vertical = 1
-toggle_mode = false
-enabled_focus_mode = 2
-shortcut = null
-group = null
-text = "Close"
-flat = false
-align = 1
-