Feature parity port of Files app

[ericfranz]

This issue is to track porting the Files app to Ruby integrated into the dashboard app.

Port should have feature parity along with these enhancements:

• Display file owner instead of UID File owner UID in File Manager #572
• Show last modification date+time instead of just date show a file's time last modified in file browser #594
• sortable by column (size, modified date, name, etc.) #271
• admin-pinned shortcuts (formerly called favorites) on the left side (replacing the tree)
• proper logging of all user actions that change state
• handle long directory file paths using dropdowns for part of the path (similar to how Box handles it)

Copy/move will use the same mechanism as existed before (click copy move to copy references to a "cart" stored in local storage, and then navigate to the directory to you want the files to be copied to/moved to, and click copy to or move to on the "cart". The big difference is we display the contents of this "clipboard moveboard" and on copy/move the progress may be displayed in a modal.

All configuration for the Files app under /etc/ood/config/files should still affect this app.

This quick port will provide a base for making more substantial changes to the UI as well as extending it to support cloud storage.

[ericfranz]

#1043 and #1040 were the final PRs