Cache \OC\URLGenerator::imagePath

Add whitespace to right of list to prevent accidental deletion when scrolling

Remove unused section

Add version and path to cache prefix

This section is now unused as the security configuration has to happen on the webserver layer since https://github.com/owncloud/core/pull/14651

Use a closure for the files app entry and deprecate old methods

Prevents to have the cache reused by other instances on the server which have possible the same instance ID and also invalidates older cache entries after an upgrade which can cause unwanted side-effects.

Impact for deployment: The same cache will only get used if ownCloud is installed with the same version and under the same path. But this should be a basic requirement anyways.

\OC\URLGenerator::imagePath is a really expensive operation due to all the I/O handling and can really benefit from caching.

Fix PHPDoc and Co.

Introducing the Raw media types

Issue/14881 closures for navigation entries

Migrate OC_Mail to SwiftMailer

Ref https://github.com/owncloud/core/pull/14929#discussion_r26501240

Fix scanFile signature warnings

Fix setup config namespace

Fix user preference key definition for insertIfNotExists()

Write the parameter 'logtimezone' into config.php during setup

Wait with getting the timezone from the smb server until we need it

This speeds up all pages that don't use the navigation by 0.04sec per app,
because we don't need to create the routing anymore, unless we really need to.

stupid me :(

Replaces the OC_Mail and phpmailer with SwiftMail allowing us to mock it properly.

Fixes the unit test execution on master on local machines and https://github.com/owncloud/core/issues/12014

Conflicts:
	3rdparty
	lib/private/server.php
	lib/public/iservercontainer.php
	tests/lib/mail.php
	tests/settings/controller/mailsettingscontrollertest.php

Conflicts:
	3rdparty
	lib/private/mail.php
	lib/private/server.php
	lib/public/iservercontainer.php
	settings/ajax/lostpassword.php
	settings/application.php

validate resource's integrity before using it

Allow specifying the compare-array for insertIfNotExists()