Rm cats from engine

[KacperFKorban]

This PR removes the dependency on cats and cats-effect from engine module.
Most notable changes:

• replaced Monoid with custom implementation
• replaced State with custom implementation
• replaced EitherT[IO, _, _] used mostly in handler classes by a custom monad FutureExcept, which can be thought of as EitherT[Future, _, _]

@pikinier20 @BarkingBad
I would actually really appreciate the review. Specifically, I would like to hear your thoughts on the API changes i.e. changes in files OutputHandler InputHandler, ConfigReader, and InkuireRunner by extension.