Add a new Python module called "updater", which contains the logic for
prompting the user to enable updates, and checking our GitHub releases
for new updates.
This class has some light dependency to Qt functionality, since it needs
to:
* Show a prompt to the user,
* Run update checks asynchronously in a Qt thread,
* Provide the main window with the result of the update check
Refs #189
Update several references to First Look Media in the code, to better
reflect the current status, where Freedom of the Press Foundation has
taken over the stewardship of the project.
Fixes#343
Debian has removed the python-all package from its Bookworm repos, which
breaks our CI tests. Looking into why python-all is required in the
first place, we found that it's an artificial stdeb requirement [1],
prior to 0.9.1 versions
The only platform affected by this issue is Ubuntu Focal, so our
solution is to install python-all specifically for that platform.
Finally, we further simplify our build tasks [2] (on Debian-like
distros) by not letting dh-python run tests when building the packages.
Running the tests has some issues after all:
1. It requires installing all the runtime dependencies of Dangerzone,
since it uses `python -m unittest discover` underneath.
2. It doesn't aid in the stability of the package, since unittest cannot
run test cases for PyTest.
[1]: https://github.com/astraw/stdeb/issues/153
[2]: https://github.com/freedomofpress/dangerzone/issues/292#issuecomment-1349967888
