Deployment Timer

[BONNe]

Description

Is your feature request related to a problem?

In #175 @wellnesscookie share his usage of "deployment" status. He uses it to give hype about upcoming challenges, which will be deployed at a certain time.
This feature could be automated.

Describe the solution you'd like us to implement.

Two new options for Challenge Object:
[] Deployment date -> Day/Time when challenge becomes available for completing.
[] Deployment timer -> How long challenge will be available for completion.

Additional context

This is an automation feature. It should not affect existing challenges, as well as default challenges should contain at least one example with this implementation.

[Espantonius]

It would also be nice to set challenges that can be completed from time to time.
Example: When a challenge is completed you have to wait 7 days to do it again. After 7 days if you complete it, then you have to wait another 7 days...

[BONNe]

Yes, this functionally does not go very well with "levels".
If the challenge is assigned to the level, player will not be able to progress untill he manage to get in time to complete a challenge.