Set required code coverage to 93% fixed

[redcatbear]

Is your feature request related to a problem? Please describe. At the moment code coverage checks complain if a commit reduces overall coverage even in the slightest. While we do not want to reduce coverage it can happen for very small commits that minimal coverage reduction happens that would be compensated by a larger commit.

Describe the solution you'd like In the end what we want is a fixed coverage goal of 93%.

Describe alternatives you've considered Requiring 100% coverage to avoid the hassle -- but that does not work since we defensively add exceptions to unreachable code conditions (like case-default in enumerations).