[Feature Request] Allow configurable icons for options menu tab

[nanypoco]

UIInfoSuite uses the in-game Blacksmith proffesion's hammer icon as the icon for the tab that are added to the options menu. However, if the proffesion icon has been changed by other mods, it may be replaced by something that does not fit the "options". So, it may be better to have a separate icon image or allow users to set their own image.