full list of enhancements:
* year slider to filter photos by freshness
* toggle active streetlevel layers with shortcut `shift+P`
* hfov, pitch and direction is now held between sequences and images as asked in #10392
* fix for #10361 (only panoramax)
* added tests and jsdoc
* add ticks for existing photos on slider
* general bug fixes
* rudimentary support for toDate in date slider (only when iD is started with a "to" date in the hash parameter: show a second slider to visualize and set the "to" date)
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Co-authored-by: Martin Raifer <martin@raifer.tech>
When changing to a different photo, it can be the case that the new photo has a different aspect ratio: the zoom behaviour needs to be updated.
Also, keeping the "orientation" does not make sense for plane photos, and even keeping the previously shown photo's zoom is also not typically desired for these.
