Rewrote the breadcrumb calculation to be more readable.

Breadcrumb now has a setMaxWidth() method to set the maximum allowed
width which is used to fit the breadcrumbs.

The breadcrumb width is now based on the container width, passed through
setMaxWidth() by the FileList class.

Now using fixed widths for the test crumbs to simulate consistent
widths across browsers which rendering engines might usually yield
different results.

Removing this doesn't affect the controls bar visually but does affect
the breadcrumb calculation when getting available width.

- serve CSS and font files properly to make sure that measurements are
  correct for the tests that need them (breadcrumb)
- added opacity to testArea to make sure nothing is visible during
  testing

Prevent loadApps on upgrade

Clear file selection when list is repopulated

Setup the external share manager in a hook

When calling FileList.setFiles() the current selection needs to be
cleared.

To make sure the external shares are initialized in the right order and
make sure the session is correctly initialized before, the external
share manager is now set up in a filesystem setup hook.

Add explanation about the current implementation of updateApp

Fixed file actions fallback

Prevent showing the file picker twice

Fixed controls bar in viewer mode

Conflicts:
	apps/user_ldap/lib/access.php

Fix many issues with drag and drop upload

In case the filepicker function is called twice, only show it once.

Some apps are calling FileActions.display() directly but omit the new
fileList argument.

This fix makes the fileList argument correctly fall back to the default
file list (the one from the "All files" section)

When uploading files or folders, they only need to be appended or
updated when their path or a section of their path is inside the current
directory (which happens for folder upload)

Fixes issue where file was appended when dragging on a parent directory
onto the breadcrumb.

Fixes appending issue when uploading folders.

Make sure last seen tooltip always appears even after searching and filt...

Added JS unit tests for ext storage

remove unused code

fix trash bin expire operation and add unit tests

Moved OC::needUpgrade() to OCP\Util::needUpgrade() to make it accessible
form the router.
Moved maintenance + upgrade check to the router.