Changed icon retrieval to use preload(), and made the paths local.

[BunkWire2X8]

I wanted to use this rather useful plugin with the Godot Global Project framework, but the problem is that it always retrieves the icon files from a predetermined "res://addons/script-ide/icon/" path. This is unfortunate, due to how the framework doesn't add editor-only addons into the "res://addons/" directory, making this normally incompatible.

This is a small edit that fixes that. Using preload(), I have these icon resources instead be retrieved from a more local relative path, which could also be argued to be a slight optimization on top of making the addon more compatible.

[Maran23]

This seems to be a safe change. Although I would prefer loading them here, as before.

My reasoning for this was, that we do not really want to preload those icons, as we will never use them. We will use a slightly different texture, made by create_editor_texture.

So if you can revert the load -> preload change while keeping the relative path, I will accept this PR. :)

[BunkWire2X8]

Ah, I see. I mainly used preload() to begin with because it allows easy use of relative paths, but since preload() is not ideal for this use case, I've now committed a change so that it now uses load() again, and concatenates the file path with the script's current base directory. It's slightly less efficient than from back when it used absolute paths, but I think it's probably fine, since this only happens on startup.

# ...
func _enter_tree() -> void:
	var script_path: String = get_script().get_path().get_base_dir()
	
	keyword_icon = create_editor_texture(load(script_path.path_join("icon/keyword.svg")))
	func_icon = create_editor_texture(load(script_path.path_join("icon/func.svg")))
	func_get_icon = create_editor_texture(load(script_path.path_join("icon/func_get.svg")))
	func_set_icon = create_editor_texture(load(script_path.path_join("icon/func_set.svg")))
	property_icon = create_editor_texture(load(script_path.path_join("icon/property.svg")))
	export_icon = create_editor_texture(load(script_path.path_join("icon/export.svg")))
	signal_icon = create_editor_texture(load(script_path.path_join("icon/signal.svg")))
	constant_icon = create_editor_texture(load(script_path.path_join("icon/constant.svg")))
	class_icon = create_editor_texture(load(script_path.path_join("icon/class.svg")))
# ...