Things to note:
* Since there is no VersionUpgrader from 4.8 to 4.9, this versionUpgrader attempts to upgrade
files made in 4.8. This means that it touches files with setting_version = 16.
* The upgrade of the setting_version to 18 is currently commented out because we are not entirely
sure that 18 will be the setting_version in 5.0.
* This versionUpgrader removes the following three settings that were removed in libArachne
* "Compensate Wall Overlaps"
* "Compensate Outer Wall Overlaps"
* "Compensate Inner Wall Overlaps"
* The VersionUpgrader also disabled Fuzzy Skin from any profiles that may have it enabled, as fuzzy
skin currently doesn't work in libArachne.
* The printer definitions have NOT been updated to the new setting_version to avoid having to deal
with an enormous merge conflict in case the setting_version of 5.0 is something other than 18.
* Since the VersionUpgrader does not alter the setting_version, it will run every time Cura starts.
In short, this versionUpgrader runs and removes the deleted settings but it does not really change
the setting_version of any files.
Contributes to CURA-7683 and CURA-7656
The buildplate meshes can be in .3mf format. When Cura is loading a printer, it may try to load
its mesh from a 3mf file. At the moment cura is starting up there is no build volume yet, so adding
a convexHull to the printer's 3mf buildplate mesh is not possible. By surrounding the addition of
the convexHull with a try-except, loading of 3mf buildplate meshes on startup doesn't cause issues.
Fixes https://github.com/Ultimaker/Cura/issues/8585
This runs a filter optimisation to choose the best PNG filters for compression, then RLE optimisation. The pixel value output is still the same, but file size somewhat smaller.
One of the weirdest errors out there, and as far as I know we're the only ones suffering from it, due to having multiple packages of Python bindings created with Sip as well as having PyQt and different threads.
This is causing a crash if self._application is used before the __init__ has finished (or at least passed the definition of self._application). That can happen in this class since some functions are called asynchronously.
It would also make writing tests easier because you can mock the getInstance() function to return a mock object, and only need to monkeypatch that for the function under test rather than also for the constructor.
Fixes Sentry issue CURA-1B5.
