Verbosity of MIRCO output

[mayrmt]

If MIRCO is used as a standalone solver, it might be fine to just write output to the screen. However, when being used as micro-scale solver within 4C, it is probably desirable to turn off MIRCO output (or at least to be able to control the amount of output).

Therefore, I propose to introduce different levels of verbosity (e.g. none, medium, extreme), so that the user can decide at runtime, how much information shall be printed to the screen.

There are several options to implement that on a technical level. Let's first clarify, whether we need or want control over verbosity, and look into technical options later.