Remove any -rc identifiers (e.g., 0.4.1-rc3) from the Dangerzone
version, if it includes them. If we don't remove them, then building
the MSI for Windows will fail as follows:
error CNDL0108: The Product/@Version attribute's value, '0.4.1-rc3',
is not a valid version. Legal version values should look like
'x.x.x.x' where x is an integer from 0 to 65534.
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
Building the `.msi` on Windows was failing in the `candle.exe` step due
to some files in the PySide6 library being too long (PySide6/examples)
or having illegal character (`+`) in their file names
(PySide6/qml/QtQuick).
Skipping copying these files to the `.msi` fixes the issue. Skipping
`examples/` should be of no impact since they're just examples and
skipping `qml/QtQuick` shouldn't cause issues because we don't use QML.
Reverts commit `bbbf822` and adapts it from PySide2 to PySide6.
