psyplot/psyplot-gui: v1.3.0: Presets and more variable info

Presets and more variable info

• psyplot-gui has been moved from https://github.com/Chilipp/psyplot-gui to https://github.com/psyplot/psyplot-gui, see #10
• variables in the dataset tree show now more content, see #16
• setting the rcparam help_explorer.use_intersphinx to None, will not use intersphinx on windows, see #20

• The psyplot gui can now load and save preset files, see psyplot#24 and [#17 https://github.com/psyplot/psyplot-gui/pull/17]{.title-ref}\_\_
• Add option to start the GUI without importing QtWebEngineWidgets #11
• Dockmixins (i.e. plugins) can now reimplement the [position_dock]{.title-ref} method that controls where the dock is exactly placed in the GUI (see #12)