If you were banned from Minehut itself use [this] link to appeal.
However if you were banned from your own server, try using /unban (username) or /pardon (username).
Im not the best with Java related things but it looks like skript-mirror which I know isn't able to be uploaded to Minehut. It looks cool, so hopefully this can be added. +1
No.
1) this has nothing to do with local variables, local variables can't be accessed from other places.
2) to create a player based variable, use {%player's uuid%::money}.
3) for more information on variables, view [this].
Is there a /itemdb command on the server? I've seen this can manage custom items. Otherwise try creating / looking a file in the Essentials plugin folder named custom_items.yml. Then follow [this] format on how to add items.
Yes, this is you getting kicked. I dont understand, I dont see anything wrong with your logs. Make sure to first join the server and get kicked, then go get the logs. Making sure to close the files and go back into them.