8a09f78173618c8bf9c2 by bollwyvl

3.3.0a3

Fix for kernel reconnect #11952 (@3coins)
Add settings UI #11977 (@fcollonval)
Show the kernel sources as a debugger tab and allow the user to break in kernel sources #11954 (@echarles)
Enable not showing editor for read-only Markdown cells #11950 (@fcollonval)
Add side-by-side margin override in the notebookConfig #11880 (@echarles)
Add additional Accel Enter keyboard shortcuts for the notebook:run-cell command #11942 (@jtpio)
Add execution progress indicator #11941 (@trungleduc)
Allow to link factory to file type when adding it #11540 (@fcollonval)
Pause on exception #11923 (@andrewfulton9)
Increase color contrast in input boxes #11922 (@fcollonval)

Overrides.json definition takes precedence #11610 (@fcollonval)
Adjust z-index of execution progress tooltip #11973 (@Sync271)
Fix the debug modules model #11967 #11968 (@echarles)
Fix autocomplete in console #11949 (@fcollonval)
Fix issue with empty notebook #11901 (@entropitor)
Ensure a single modal is opened in case of time conflict savings #11883 (@echarles)
Restore line number state when stopping debugger #11768 (@fcollonval)

Update screenshots and text for user interface docs #11982 (@fcollonval)
Update several extensions readme files to delete old content. #11947 (@jasongrout)
Remove theme cookiecutter from the docs #11928 (@jtpio)