Improve setting of IPP options
Current Printers panel shows IPP services as printers but does not allow them to be configured. This needs to be fixed as all printers will be shared as IPP services over DNS-SD (Avahi) in the near future.
For this we need to collect all settable IPP options and automatically create UI inside options dialog. There are 3 options which currently works this way, these are "sides", "number-up" and "orientation-requested". There is several sources from which we can get IPP options, these are:
job-creation-attributes-supported IPP attribute printer-settable-attributes-supported IPP attribute and other "*-supported" IPP attributes but these need to be filtered
Once we have the options we have to divide them into groups as we do now but currently we divide them with help of PPD files.
If possible then get translation of the options and their values. Some of those could be found in file which can be found on "printer-strings-uri" URI.
For being able to query the IPP service we might need to create a temporary queue out of it. These are queues which last for 60 seconds (see e.g. gtk's CUPS print backend how to do that). You can configure it then and such configuration should outlast temporary queue until it shows up next time.