[Feature] Notify players of new questbook updates

[bruberu]

On world load, a notification could be provided telling the player to load the new quest database if some detection script notices a difference between the player's loaded quest database and the default one. Hopefully, this would remove the need to tell players to run /bq_admin default load every time the questbook updates.

[WaitingIdly]

for several years there has been a button in the top right of the home page to update in singleplayer, and there is now a config to automatically update that was introduced in #141.
note that this only applies if the pack_version number is higher than the currently loaded one.