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fix BadRequest error if CONTENT_LENGTH not set

Move trusted domain check to init()

Refactor cache updater to work outside of the users home

Scroll to file on search or add

handleRequest() is not called from remote.php or public.php which made these files party available but all included apps in there produced errors.

As the expected behaviour is anyways that a trusted domain warning is shown I moved this to init()

Fixes https://github.com/owncloud/core/issues/10064

Added permission check for drag and drop

Fix 3rdparty pointer

When dropping files onto a read-only folder, a notification
is now shown instead of attempting to upload.

This for both the drag for upload and drag from inside the file list
cases.

Solve bug with touch always return true on /lib/private/files/view.php

Fix upgrade process when apps enabled for specific groups

If client does not send content length header on webdav upload (e.g. because the content comes from a stream and its length is not predictable) the put() method should not try to compare the content length value with the actually amount of received data, because this will always fail and results in a BadRequest exception. So the check will only be performed if $_SERVER['CONTENT_LENGTH'] is set.

add utf8 folder test

When creating a new file from the menu, the list now scrolls to that
file.

Now passing the "scrollto" URL argument to the file list class which
will also automatically scroll and highlight the matching element.

This code is triggered by the search box when in a different folder and
also by the activity app.

added missing User-Agents

Use proper RNG

* owncloud/UseProperRandomFunction:
  Use proper RNG generator

Scroll to uploaded file in file list

Hiding add to your own cloud if server2server sharing is not enabled

Some providers block connections with missing user-agents. Also
user-agents are useful for analyzing requests. I've added a USER_AGENT
constant that is used in cURL and in file_get_contents.

OC_Util::generateRandomBytes() only returns lowercase alphanumeric values.
We should use the new RNG which has a broader characterset.