Merge branch 'wip' - preparing version 2.0

Conflicts:
DOCUMENTATION.md
MANPAGE.md
README.md
bin/colors-rendering-benchmark.sh
bin/colors-test.sh
bin/test.sh
doc/Common-options.md
doc/Global-doc.md
doc/Man-pages.md
doc/Versioning-Licensing.md
src/piwi-bash-library.man
src/piwi-bash-library.sh