Feature Freeze, time for reviews!

[fendor]

Hello, everybody! The long term goal of making hie-bios ready to merge has been achieved! CI is all green!

But before merging, I propose a day of review time!
Especially going through the README and fixing Documentation issues would be important in my opinion and to delete unused code and update documentation, except when there is a TODO or a specific goal to re-integrate the unused code again, e.g. HaRe code fragments.

I also would suggest that the time for review ends on Friday, 20.12.2019, unless someone wants to review but has no time till the weekend.

Also, it would be very nice if we find the time to document features that are disabled right now, but we want to fix in the next weeks, such as HaRe and goto-definition cross module.

Is this an acceptable deadline, @mpickering, @alanz, @bubba, @jneira? And whoever has the time and the will to review this behemoth pr.

This issue is tightly coupled with #48.

[fendor]

Feature freeze is over, we merged!