Fixed dependencies, places where obsolete functions stopped working,
code fragments that started throwing warnings and an .ui file that
stopped being readable after the update.
PCI devices are now handled as DeviceInfo objects, not (string,name) tuples;
furthermore, a device that no longer exists in the system can be
correctly removed via VM settings window (it is displayed as Unknown
device).
fixesQubesOS/qubes-issues#2789
The button is in 'devices' tab of VM settings; it allows the user to
select which devices should have 'no-strict-reset' enabled and tells
the user not to change this setting if there are no errors.
fixesQubesOS/qubes-issues#3205
