Make search work more clearly now that it's on toolbar

Fixes #2242 and related cleanups
WIP: timeline rewrite, consolidation

Display and forms generally work, video still broken, other minor issues
timeline: minor improvements, fixes, remove redundant info
Fix video registration, due to view controllers being unfortunately unnamed
fixed z-index where dropdowns are covered by user avatars in authSearchForm
took out color change to yellow in editVolumeMaterialsForm dropzone before people can actually successfully drop a file
Merge branch 'regrid'
update toolbar styling so things don't eat into ea other