Implemented shortcut focus

"Ctrl + L" zaps focus to the DM's combatant list. Will work on
selectively changing to the relevant list ("listCombatants" if the user
is on the Player tab and "combatantList" otherwise).
Implemented "Move Down" button

Combatants can now be moved up or down the list as the user sees fit.
Implemented delay feature

Complete with the shortcut "Ctrl + D" to move focus to the delay list.
Implemented "dead and dying" list

Functionally identical to the delay list except it's where dead and
dying combatants are shifted. They can be shifted into it by pressing
Ctrl + K (kill) and shifted out of it by pressing Ctrl + R (revive).
Focus can me moved to the list with Ctrl + U (unconscious).