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.
Fixed Dropbox/Google storage async save call

When clicking "Grant access", the settings for Dropbox/Google were saved
through a call that gets cancelled when redirecting to the grant page
(for example in Firefox)

This fix makes sure the "save settings" call finished before redirecting
to the grant page.

Fixes #6176
change mail address by pressing enter - fixes #6179
fix typo
Unshare all will now delete all shares for the item, instead of only for a single owner.
Fix calculated folder size to use unencrypted size

The encrypted size was used when calculating folder sizes.
This fix now also sums up the unencrypted size and shows that one when
available.
updated the unit test for OCP\Share::unshareAll() to verify that shares by all users are removed for an item.
Disabled internet checking as mentioned when in proxy mode
Fix unallowed child elements
Extend margin to avoid displaying a scrollbar
Add alt attribute for img elements
fix upload button layout
remove extra upload controls
modify js to move upload wrapper, modify css to match core values
Added SVG fallback to apps settings popup

This fix issue of calendar app with IE8, see issue report for details:
https://github.com/owncloud/calendar/issues/291
keep response message