Added new event to handle fetching media properties like height, width, and the newly added fields, and admin controls to manually scan files for their properties.
Added a search terms content:video and content:audio to search for images that do (or do not) have those flags.
Bug fixes and consolidation of various thumbnail and resize functionality
Changed resize/rotate extensions to use replace image event
Added content-disposition header to image responses to provide a human-friendly filename when saving
Added more bulk thumbnail regeneration tools
Tweaks to bulk actions to correct totals when batching items
