Thanks to the useful report of TewiInaba I fixed several bugs related to a specific use of the command, using a quest command after a game load and before opening the questlog!

While on it I changed the icon selector from a number input to an actual icon showcase!

Always on suggestion of TewiInaba I added a couple of Script Calls to check quest completion by ID or name from anywhere in RPG Maker MZ or from other scripts!

Enjoy!

VERSION 1.6:

•  Fixed a bug were the old quest files would be deleted if any quest action (like accepting a quest) would be done after reloading a save and before opening the questlog. (Thanks to TewiInaba for the report)
• Fixed a minor bug in the "Complete Quest" command
• Changed the Icon selection parameters from a number to an icon selector
• Added an external script call to check quest completion, see help