Automatically display prints even while running blocking code

[MHendricks]

When writing to the console, check if more than X seconds have passed from the last refresh triggered by a write and force a display update if so. This only updates the consoles and does not call QApplication.processEvents.

This attempts to only update the PrEditor consoles without calling QApplication.processEvents() for every update. However if the application looses focus it would eventually stop updating so after 5 seconds it will call processEvents unless that preference is disabled. You can control how often a print will trigger a refresh in the preferences. It defaults to 0.2 seconds which provides a near real time updating without excessively redrawing the consoles.

Also adds pythonw.exe protection to the recent If an error happens processing excepthook/console write it to stderr commit. If running in pythonw.exe sys.__stderr__ is None which gets written to stdout causing recursive attempts to write. This change now prevents those writes and will require generating the error using python.exe.

Checklist

• I have read the CONTRIBUTING.md document
• I formatted my changes with black
• I linted my changes with flake8
• I have added documentation regarding my changes where necessary
• Any pre-existing tests continue to pass
• Additional tests were made covering my changes

Types of Changes

• Bugfix (change that fixes an issue)
• New Feature (change that adds functionality)
• Documentation Update (if none of the other choices apply)

Demo

j1G4hIJi5u.mp4

1. Shows updating enabled every 0.2 seconds showing near real time output.
2. Shows limiting updates to every 5 seconds to further reduce any performance hits caused by many updating the UI.
3. Shows disabling the new feature entirely.
4. Shows that if no prints are used Qt won't be automatically updated.