"Stay in cells" Shit ct's

[Byte]

Hmm this would be a decent change.
Rules page: https://www.invexgaming.com.au/showthread.php?tid=840


Current relevant rules:

CT7: GUARDS must wait a total of 5 seconds for PRISONERS to exit their cells before killing PRISONERS still in cells.
CT18: GUARDS cannot give special orders to PRISONERS in their cells before they're open unless they are in a hot cell.

We can either modify these rules (probably CT18) somehow or add a new one?

CTXX: GUARDS cannot keep prisoners inside cells once cell doors are open.