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This now leaves us with exactly one path for adding or changing
reservations.

Only needed when using widgets or QQC1 (which we don't).

Also, drop the manual location id support here, backends can resolve this
themselves nowadays.

Summary: Importing a reservation from an intent only worked when that intent started the app. When the app is already running onNewIntent is called, but since we didn't override it nothing was imported.

Test Plan: Open app. Send reservation via KDE Connect. Previously nothing happend. Now the reservation is added to the list

Reviewers: vkrause

Reviewed By: vkrause

Subscribers: kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D17993

This gives us live data for SBB and NS, for example. Still needs location
query support for becoming practically useful.