## About The Pull Request
Adds a signal when someone buys an item from the uplink and removes
single-letter vars from the ``spawn_item`` proc, and adds/standardizes
add/removing of telecrystals from uplinks (and admin setting how much TC
they have) to ensure the UI always has the right amount of telecrystals
displayed in it.
## Why It's Good For The Game
There are reasons why someone would want to hook up to a traitor's
uplink and listen to items they purchase to do any special effect
on-purchase, so this adds support to do anything in the future with it.
Also tells players how much TC they actually have without forcing them
to close/reopen the UI every time they insert some TC in it by hand.
## Changelog
🆑
fix: Uplinks now update their UI when you add telecrystals in them, so
you don't need to close and reopen it.
/🆑
fdcd4d3979