Create Countdown (w/ placeholders)

[TimHarrio]

Description of feature/improvement request:
Being able to also create cooldowns in CMI and execute commands at the end of this would be handy. It would also require Placeholders with the remaining time (ex: "3h 2m 1s").
I often use cooldowns and I have to do it with Javascript but it is not practical and in addition I cannot execute commands at the end of these.

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Detailed explanation of what it should do, when and in what situation:

When we vote execute a cooldown which after 24 hours will remind us to vote.
If with CMI we can create cooldowns we can easily use placeholders with it in Deluxemenu (Kits, Upgrades, etc ...)

Basic explanation as to why this feature is needed and/or useful to have:

[Baktus79]

There are cooldowns in CMI already

Cooldowns:
  # You can enable any command cooldown to prevent instant usage of it
  # cmi heal:180 means that player can use /cmi heal command only once every 180 seconds
  # if cooldown set to -1 then this command can be performed only one time
  # Administration can bypass limitations with cmi.cooldownbypass.[commandname] permission node
  # Always use full command name and not its alias
  # ATTENTION! If you have command like "/cmi home" and you want to prevent teleportation to home but allow gui opening without restrictions, use space after command, in example "cmi home :10"
  Enabled: false
  List:
  - cmi heal:180
  - cmi feed:120

WarmUps:
  # You can enable any command warmup to prevent instant command usage
  # tp:5:false means that when player performs /tp command he will need to wait 5 sec
  # false variable is optional and when its set to false player cant move while warmup is counting
  # If you dont want to deny empty warp command but want to deny any extra variable after that, then just add space, in example 'warp :5:false'
  # When setting warmups for CMI commands, use full command name and not allias, in example 'cmi warp:5false'
  # Administration can bypass limitations with cmi.command.[comandName].warmupbypass permission node
  # ATTENTION! cmi home command is being handled in special way and to prevent double warmup, add space, example: - cmi home :5:false
  # Experimental: add GlyphHead to the warmup to show particle effect while command is on warmup period. Like
  # - cmi warp :3:false:GlyphHead
  Enabled: true
  InformOnNoMove: true
  List:
  - cmi tp :5:false
  - cmi back:3:true
  - cmi warp :3:false
  - cmi home :3:false

[TimHarrio]

No, what I propose is that we can launch for a player a countdown of 3 days for example and that after these 3 days an order is executed (and add a placeholder to know how many days is the countdown)