[Request] Hotkeys for staff

[gsuberland]

I'd like to see various hotkeys for staff.

It'd be great to be able to cycle through all instances of each actionable staff type (guard, doctor, cleaner, worker) so we can quickly select them to perform a task. For example, press G and it selects the nearest guard, press G again and it selects the next nearest guard, etc. Double-tapping G could select all guards on screen.

One improvement to this, to things easier for the player, would be to show a little summary on the bottom of the screen that shows what the actor is currently doing, with a border colour that identifies whether the current action is an "idle" action (e.g. wandering about), an "auto" action (e.g. currently moving a prisoner to solitary) or a "player" action, i.e. something the player specifically told them to do.