Add tooltip library, based on the sellvalue item hooks,
in order to obtain extended gametooltip data, that can be used
to query the current GameTooltip for ItemLink and ItemID.
* Checks for redundant and incompatible addons.
* Asks the user for soft-conflicts if they want to keep it
* Saves soft-conflicts to not annoy the user on every login
* Automatically disables hard-conflicts