Converts em to px values for styles in Files.
Cleans up Core apps for relative(em) to absolute(px) styles.
All Core Styles from em->px, apart from styles.css
#6051 [ux][files] Move File Spinner

Added spinner to file icon when moving to new folder or out of folder.

Commit is related to #6051
Fixed indention.

As per @kabum request, indention on line 694 has been fixed.
Fix unallowed child elements
Extend margin to avoid displaying a scrollbar
Add alt attribute for img elements
first mobile style rules, hide extra columns in files view and scroll header
remove min-width rule to fix mobile views
Merge branch 'master' into files-em-to-px

Conflicts:
	apps/files/css/files.css
reuse file upload as used within files app - remove public upload button
fixing preview generation
no new menu on public upload
remove unused js code and css rules
add download button on single file share page
improvements to public files mobile view
remove unused log icon
tweak color and position of username in public share
Fixes Trashbin and Files Style Conflicts, more em to px conversions post rebase