v4.15.0 - GUI and stability improvements

[AlessioGr]

ATTENTION: VERSION 3 AND OLDER ARE NOT COMPATIBLE. ⇒ [Updating from <v4 guide](https://www.notquests.com/docs/documentation/updating-from-v3-or-older/).

• [+] New Quests visibility evaluation system for the GUI. Quests are now hidden in the GUI by default, if they are already accepted or if the max-accepts for the quest is reached. It can be tweaked in the general.yml. There you can disable it, or also make it check for quest conditions or the cooldown.
• [+] Added some more debug commands which might be helpful for some people (like /qa debug worldInfo)
• [^] Greatly improve the way errors are handled. NotQuests no longer disables itself completely, preventing further errors.
• [^] Enforce safe folder names for conversation create command
• [!] Attempt to fix Citizens loading error

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This discussion was created from the release v4.15.0 - GUI and stability improvements.