[sharing] rename mount point of children if parent was renamed

Handle storages not being available in webui and webdav

Design fix usermgmt glitch

Fix service warning

drop unneeded code

don't typecast null values inside dispatcher.php

Fix fileActionsReady event after deferred file actions update

initialize a dummy memory session - fixes https://github.com/owncloud/ac...

Fix files list scroll behavior

increase width of version dropdown - fixes #9270

Redirect after session expiry to the previous loaded page

View container height needs to be accurate and span over the whole
scroll container for infinite scrolling to work properly.

Whenever file actions are modified, either by registering new actions or
when appending a new page of entries, the sharing app is now notified so
it can correctly refresh the sharing icon status.

Additionally, the core's loadIcons() method is also used to load the
existing shares and also refresh the sharing icons afterwards.

Added migrator test for reserved keyword

Default app fix

fix the layout of the enforced expiry date message

* fixes #6945

Also separate the function into getDefaultPageUrl() and
redirectToDefaultPage() to make it testable.

Hides table header while users load in User Management

If a default app isn't visible for the user, try the next one.
Else fallback to the "files" app.