Provide a way for the user identify which frequencies they've already used

[LandonCalling]

HI! First I want to say how much I have enjoyed using your mod in the various modpacks I have played recently. Thanks for all the effort you put into making this mod work.

One of the biggest obstacles I face to using DimStorage over similar mods is that I don't find the numerical frequency system memorable. I am constantly doubling up on channels, particularly when I am using both the chests and tanks, which just ends up gumming up my automation.

Ideally I'd love for the frequency assigned to be alphanumeric, even something short like 3-4 characters would be more memorable than a strictly numeric system. However, I'm not versed enough in Data Structures and Algorithms to know how that increase in memory requirement would affect your codebase.

My alternative suggestion would just be a command that could be run in either the chat window or through use of an item that would list which frequencies had been used and group them together as either tanks or chests.