FEAT: Add a possibility to name vaults

[ghost]

It would be nice if we could name specific vaults so that we can open it using a name instead of a number. For ex. I have 5 vaults and can access them with /pv <number>.

I wish I could do something like /pvname <number> <name> after wich I could open a vault with /pv <name>.

This will make it easier to organize items in vaults, because instead of remembering in which vault did I put what, I can do /pv armor or /pv food.

Ofc the command would need a countercommand, so either calling /pvname again would rename existing one, or /pvdelname <number> would remove the name completely. The named vaults would be still accessible via their numbers, so it's only an addition to the current functionality.

Cheers.

[mbax]

Names coming in next big update 😄

[triesharder]

Also requested on #404