UPDATED

* Hide iconic taxon chooser on ObsEdit when non-iconic taxon chosen
* ObsDetail tab bar sticks to the top of the screen on scroll
* iOS: zoom button restricted to multicamera devices, starts at neutral
* My Observations should display observations in order of date added
  descending
* Fixed layout bug with back button on MediaViewer
* Stop AddEvidenve bottom sheet from appearing over StandardCamera in Android
  12
