Added advanced checkbox

This adds an advanced mode to the title dock that allows the user to see advanced blocks,
which will help us add advanced blocks without cluttering the block list.

I implemented it by:
- adding `is_advanced` boolean to the `BlockDefinition` class and set the default value to false.
- adding an "advanced" checkbox to `main_panel.tscn`
- modifying `picker.gd` to filter the block list to hide advanced blocks if the checkbox is unchecked.

Fixes #282

addons/block_code/code_generation/block_definition.gd

@@ -28,6 +28,8 @@ const FORMAT_STRING_PATTERN = "\\[(?<out_parameter>[^\\]]+)\\]|\\{const (?<const
 ## Empty except for blocks that have a defined scope
 @export var scope: String
 
+@export var is_advanced: bool
+
 @export var extension_script: GDScript
 
 static var _display_template_regex := RegEx.create_from_string(FORMAT_STRING_PATTERN)
@@ -46,6 +48,7 @@ func _init(
 	p_signal_name: String = "",
 	p_scope: String = "",
 	p_extension_script: GDScript = null,
+	p_is_advanced: bool = false,
 ):
 	name = p_name
 	target_node_class = p_target_node_class
@@ -59,6 +62,7 @@ func _init(
 	signal_name = p_signal_name
 	scope = p_scope
 	extension_script = p_extension_script
+	is_advanced = p_is_advanced
 
 
 func create_block_extension() -> BlockExtension:

addons/block_code/ui/main_panel.gd

@@ -86,6 +86,11 @@ func _on_delete_node_button_pressed():
 	dialog.connect("confirmed", _on_delete_dialog_confirmed.bind(_context.block_code_node))
 
 
+func _on_advanced_checkbox_toggled(is_advanced: bool):
+	_picker.set_advanced(is_advanced)
+	_picker.reload_blocks()
+
+
 func _on_delete_dialog_confirmed(block_code_node: BlockCode):
 	var parent_node = block_code_node.get_parent()
 

addons/block_code/ui/main_panel.tscn

@@ -60,6 +60,10 @@ unique_name_in_owner = true
 layout_mode = 2
 size_flags_horizontal = 3
 
+[node name="AdvancedCheckBox" type="CheckBox" parent="MarginContainer/HBoxContainer/ScriptVBox/HBoxContainer"]
+layout_mode = 2
+text = "Advanced"
+
 [node name="ShowScriptButton" type="Button" parent="MarginContainer/HBoxContainer/ScriptVBox/HBoxContainer"]
 layout_mode = 2
 size_flags_horizontal = 0
@@ -119,6 +123,7 @@ block_canvas_path = NodePath("../PickerSplit/MarginContainer/VBoxContainer/Block
 
 [connection signal="pressed" from="MarginContainer/HBoxContainer/ScriptVBox/HBoxContainer/ShowScriptButton" to="." method="_on_show_script_button_pressed"]
 [connection signal="pressed" from="MarginContainer/HBoxContainer/ScriptVBox/HBoxContainer/DeleteNodeButton" to="." method="_on_delete_node_button_pressed"]
+[connection signal="toggled" from="MarginContainer/HBoxContainer/ScriptVBox/HBoxContainer/AdvancedCheckBox" to="." method="_on_advanced_checkbox_toggled"]
 [connection signal="add_block_code" from="MarginContainer/HBoxContainer/ScriptVBox/MarginContainer/PickerSplit/MarginContainer/VBoxContainer/BlockCanvas" to="." method="_on_block_canvas_add_block_code"]
 [connection signal="open_scene" from="MarginContainer/HBoxContainer/ScriptVBox/MarginContainer/PickerSplit/MarginContainer/VBoxContainer/BlockCanvas" to="." method="_on_block_canvas_open_scene"]
 [connection signal="replace_block_code" from="MarginContainer/HBoxContainer/ScriptVBox/MarginContainer/PickerSplit/MarginContainer/VBoxContainer/BlockCanvas" to="." method="_on_block_canvas_replace_block_code"]

addons/block_code/ui/picker/picker.gd

@@ -38,6 +38,7 @@ var scroll_tween: Tween
 
 var _category_buttons: Dictionary  # String, BlockCategoryButton
 var _category_displays: Dictionary  # String, BlockCategoryDisplay
+var _advanced_mode: bool = false
 
 
 func _ready() -> void:
@@ -74,6 +75,10 @@ func _update_block_components():
 
 	for category in block_categories:
 		var block_definitions := _context.block_script.get_blocks_in_category(category)
+
+		if not _advanced_mode:
+			block_definitions = block_definitions.filter(func(definition): return not definition.is_advanced)
+
 		var order_override = CATEGORY_ORDER_OVERRIDE.get(category.name)
 		if order_override:
 			block_definitions.sort_custom(_sort_blocks_by_list_order.bind(order_override))
@@ -136,3 +141,8 @@ func _category_selected(category_name: String):
 
 func set_collapsed(collapsed: bool):
 	_widget_container.visible = not collapsed
+
+
+func set_advanced(advanced: bool):
+	_advanced_mode = advanced
+	reload_blocks()