Add the rested XP cap to Timers

[Nixxe]

It's not on a timer, though? It just accumulates while you're in a sanctuary.

It's not something that you get a chunk of at a designated time of day, which is what the Timers menu tracks.

This is pointlessly literal and also ignores the fact that fc crafts, which have no time-dependence whatsoever, are displayed in timers. The amount of time required to reach the rested XP cap while in a sanctuary is a finite, calculable amount and could be displayed. Timers is the most sensible place to put it, though sure, I don't really care where they stick it as long as they add it.