Stereo bugfixes

[BryonLewis]

resolves #1520
resolves #1522
resolves #1529

• Fixes some errors where feature frame on Desktop had some undefined values causing head-tail creation to fail. Similar issue in the useLineChart functionality.
• The cursor setting when reloading annotations while in multi-camera caused a brief issue so I guarded against that.
• Updated the input field to add measurement pipelines. detections will now be injected into any pipeline that has measurements.
• Minor adjustment to multi-select so that it will properly select across multiple cameras
• Update the CSS for the multiCameraTools so it renders properly.

[naglepuff]

LGTM

[BryonLewis]

Thanks Mike, I'm going to wait until testing of the built versions is complete by Matt before merging. Just in case there are changes required.