Allows TGUI labelled lists to use tooltips, and enables this behavior on preferencelists + adds descs to most character preferences (#79356)

## About The Pull Request

Title.


https://github.com/tgstation/tgstation/assets/59709059/c9fa7d41-6ca4-4b8b-97ec-fdfdd437ce25

## Why It's Good For The Game

The inability to use descriptions in character preferences really limits
the context you can give to readers, which becomes a big problem when
preferences become complicated or laden with policy that must be given
to the reader.
## Changelog
🆑
qol: Character preferences now have descriptions as tooltips - hover
over their names to see them
/🆑

code/modules/client/preferences/README.md

@@ -28,7 +28,7 @@ export const savefile_key_here: Feature<T> = {
   // Necessary for game preferences, unused for others
   category: "CATEGORY",
 
-  // Optional, only shown in game preferences
+  // Optional, shown as a tooltip
   description: "This preference will blow your mind!",
 }
 ```