Remove or repurpose the type field in the controls section of the Everest configuration

[verveerpj]

Is your feature request related to a problem? Please describe.
The type field in the controls section of the Everest configuration is not used and can be removed or re-purposed.

Describe the solution you'd like
We should investigate if this field is indeed not used for anything meaningful. We will likely find that this field is very often specified in existing configuration files, but not used in any way. Based on this information, we can decide if we want to remove it, or repurpose it within the context of this issue: #9537.

Describe alternatives you've considered
We could leave it as is, it would not affect functionality.