Related to #2730

It struggled with the copyright lines included as string literals.

We now show the more modern `-S {source}` instead of the old and
undocumented `-H{source}` CMake flag, and also show the available
presets, instead of individually specifying the different testing
options.

Closes #2593

Instead of redoing the whole line where path was found, only the
directory part of the path is removed, instead of removing all
of the line before the path starts.

This results in slight change in how junit and sonarqube approvals
come out, and significant change in how TeamCity reporter approvals
come out. This latter difference is the reason for the change,
as now the lines with `testFailed` and `testIgnored` messages
are not completely butchered.

* Remove from __future__ import print_function, because we
  no longer support Python2.
* Clean out unused parts of tools/scripts/scriptCommon.py
* Move appveyorMergeCoverageScript to Python3
* Update user reporting in *release scripts
* Cleanup module imports

This has two effects:
 1) This significantly improves the performance of ApprovalTests
    run in WSL, because running the massively multi-reporter
    test would cause lots of small and parallel writes across the
    WSL-Windows FS boundary, completely mudering performance.

 2) ApprovalTests can be run from multiple build dirs in parallel,
    as long as they do not fail. However, if they do fail,
    the multiple runs will still step on each other toes when
    writing the unapproved files for user.