UI improvements to the autofill attributes view

[robyngit]

After the initial release of the Auto-fill Attributes View, there are some more minor UI improvements we could make in order to make copying attributes a litter easier and more intuitive:

• When there is an error (e.g. filling attribute info from file fails), show an "alert" element with more details about the technical reason for the failure. Current behaviour is to show generic reason in the button element.
• In the "fill from file" tab, show basic information about the file that info will be filled from (file name, size, type, etc.)
• In the "copy to" tab, indicate which files already have attributes, since these will be over-written. For example, show a label/pill element next to the filename with # of attributes.
• Make it easier for users to handle copying attributes to many files within the data package:
  • Add ability to select all or select none of the files
  • Add search/filter functionality and sorting
  • Consider grouping files by some property (like file size or type)
  • Lazy-load checkbox groups if the list is massive
• If "fill from file" is not supported for the given file type, then start the autofill view on the next tab/action: copy from