Now all CPAP loaders have access to the unsupported/untested/brick signals
and CHECK_VALUE and UNEXPECTED_VALUE macros.
Also remove superfluous unsupported flag in MachineLoader.
- Oximetry loader from file now remembers last directory data was imported from.
- ResMed loader loads from last day or oldest purge date if a day was purged since last import.
purgeDate added to MachineInfo to implement this. Purge date set when a day is purged and cleared after an import.
This introduces a very slight change UI behavior, where the user
will receive an alert if their machine has a supported family/version
but is a model number for which we don't have any test data.
Also, the user alert for an unsupported machine has been updated
to align with the actual underlying parsing limitations. It's
possible this will create some new warnings, but it doesn't seem
like any such machines would have worked anyway, in which case
an explanatory message is an improvement.
The "untested" alert will happen on import once per launch of OSCAR.
Ideally this would only happen the first time an untested machine is
imported, but that will require figuring out how to serialize an
additional value in the user's machine profile.
