Remove unused argument in Theme method and expose missing methods

[YuriSizov]

Fixed #36880. Breaks compatibility.

Changed signature:

• Theme.get_type_list(String type) -> Theme.get_type_list()

Renamed:

• Theme.get_stylebox_types() -> Theme.get_stylebox_type_list()

Added:

• Theme.get_color_type_list()
• Theme.get_constant_type_list()
• Theme.get_font_type_list()
• Theme.get_icon_type_list()

As the type argument is never used in get_type_list, I've removed it, and fixed the documentation as well. I've also noticed, that there is a separate method to get types of styleboxes, but there are no methods for other entities. I've introduced them and named all of them to match get_type_list, for consistency. New methods are new to the engine as well and can be used internally, if one requires them.

Due to the removed argument and the renamed function this is a breaking change.

Test script

tool
extends EditorScript

func _run():
	var theme = Theme.new()
	theme.set_color("red_color", "FirstType", Color.red)
	theme.set_color("green_color", "FirstType", Color.green)
	theme.set_color("blue_color", "SecondType", Color.blue)
	
	theme.set_constant("what_const", "FirstType", 3)
	theme.set_constant("this_const", "ThirdType", 4)
	
	theme.set_font("some_font", "FontType", null)
	
	theme.set_icon("default_icon", "", null)
	theme.set_icon("custom_icon", "IconsType", null)
	
	theme.set_stylebox("panel_style", "Panels", StyleBoxFlat.new())
	theme.set_stylebox("box_style", "Panels", StyleBoxEmpty.new())
	
	var theme_types = theme.get_type_list()
	print("found theme types: ", theme_types.size())
	for type in theme_types:
		printt("type: ", type)
	
	var color_types = theme.get_color_type_list()
	print("found color types: ", color_types.size())
	for type in color_types:
		printt("type: ", type)
	
	var constant_types = theme.get_constant_type_list()
	print("found constant types: ", constant_types.size())
	for type in constant_types:
		printt("type: ", type)
	
	var font_types = theme.get_font_type_list()
	print("found font types: ", font_types.size())
	for type in font_types:
		printt("type: ", type)
	
	var icon_types = theme.get_icon_type_list()
	print("found icon types: ", icon_types.size())
	for type in icon_types:
		printt("type: ", type)
	
	var stylebox_types = theme.get_stylebox_type_list()
	print("found stylebox types: ", stylebox_types.size())
	for type in stylebox_types:
		printt("type: ", type)

Test output (formatted for readability)

found theme types: 7
type:
type: IconsType
type: FirstType
type: SecondType
type: ThirdType
type: FontType
type: Panels

found color types: 2
type: SecondType
type: FirstType

found constant types: 2
type: ThirdType
type: FirstType

found font types: 1
type: FontType

found icon types: 2
type:
type: IconsType

found stylebox types: 1
type: Panels

[YuriSizov]

I've rebased this PR against the current master. It was messy due to intermediate changes between April and today, but I think I've got it working. The test script is producing the expected results still.

[akien-mga]

Thanks!