Metadata improvements

[BryonLewis]

resolves #205
resolves #206
resolves #207
resolves #208

• Regular expression icon added to search fields
• The linking and filtering using regular search expressions is working so the data can be pasted in the system.
• Fixes and Improvements to adding/deleting metadata
• Added option to 'Purge' deleted keys (this will delete the value from all metadata in the system, not just remove it from the filters).
• Processing loading indicators for updating and deletion of tasks because depending on the number of metadata fields it may take a while.
• Fixing Metadata editable values not updating in the main display, but updating in the advanced view
• Fixing URL parameter loading to properly load the advanced filters if there is an advanced field.
• Update client dev and job linking in the interface to link to the / root path instead of /girder. The /girder path is causing issues when jumping back to DIVE.
• Fix styling for unlocked/editable fields

DIVE-MetadataUpdatesSmall.mp4