Implement separate configs for gamemodes

[wellnesscookie]

Description

Is your feature request related to a problem?

Yes. BentoBox supports 2 gamemodes, so I thought that Challenges shouldn't have their General settings shared within them, but rather have separate for each gamemode. To be more precise, there is only one config.yml

Describe the solution you'd like us to implement.

Have as much configs as there are gamemodes
An example:

• Bskyblock_config.yml
• AcidIsland_config.yml

Describe alternatives you've considered.

I'm aware it's a hell of a work, so I don't have big expectations about the ETA, nor the implementation possibility itself