This commit introduces a new more relaxed theme, the dark theme!
In addition, the theme can now be selected according to the system defaults.
And the other themes, as well as the general structure were unified/simplified.
Co-authored-by: Philipp Ahrendt <philipp.ahrendt@cloudogu.com>
Co-authored-by: Eduard Heimbuch <eduard.heimbuch@cloudogu.com>
Co-authored-by: René Pfeuffer <rene.pfeuffer@cloudogu.com>
Co-authored-by: Matthias Thieroff <matthias.thieroff@cloudogu.com>
This replaces the SCM-Manager logo for the plugins
without own icons with a version with a transparent
background to make it less intense in dark themes.
