File browser

Compliment for auto complete for paths.

Currently if a modal is open and you open file browser (Edit Series) then the original modal is lost, I played around with restoring the original modal when the file browser is closed, but it isn't very smooth and causes issues with updating the input i the original modal. A second modal with a larger z-index would hide the original one, but we'd still need to make sure we're handling bootstrap events properly (clicking outside of the modal) so we don't kill both modals.
I agree (not sure why it was ever here), I'll move it to core.