Guidata

Bug fixes:

* Fixed PySide6 compatibility issues
* Fixed remaining Python 3 compatibility issues

Bug fixes:

* Fixed Python 3 compatibility issues

Changes:

* Removed support for Python 2.7 and PyQt4 (guidata supports Python >=3.6 and PyQt5, PySide2, PyQt6, PySide6 through QtPy 2)
* Added support for dark theme mode on Windows (including windows title bar background),
MacOS and GNU/Linux.
* Added embbeded Qt-based Python console widget
* Dataset edit layout: now disabling/enabling "Apply" button depending on widget value changes
* Code editor: widget minimum size area may now be set using rows and columns size
* Test launcher: redesigned, added support for dark mode

Changes:

* Added generic widgets: array, dictionary, text and code editors.
* Removed `spyderlib`/`spyder` dependency.
* Added setter method on DataItem object for "help" text (fixed part of the tooltip).

Changes:

* Added PySide2 support: guidata is now compatible with Python 2.7, Python 3.4+, PyQt4,
PyQt5 and PySide2!

Changes:

* Added PyQt4/PyQt5/PySide automatic switch depending on installed libraries
* Moved documentation to <https://docs.readthedocs.io/>