Moved SQLite setup warning to top.

Introduce public storage class for extending

Adding report support

When writing external storage it is complicated to reimplement IStorage
and many others. This PR provides public classes to be extended to
provider storage specific implementations.

Windows's dead baby, windows's dead!

Filesapi renamefailcase

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Don't fetch preview images if `enable_previews` is set to `false`

Add test for duplicate 401 headers on DAV

createMock only accepts a single param

Whenever a rename or copy operation failed on the view, we must throw
an exception instead of just ignoring.

Remove obsolete use var

commit transaction after select query

* Correctly convert OCS permissions params

* Added tests about permissions and public upload

Added read and share permissions instead of all (default ones)

Added positive case

Check also permissions update

Added tests for resharing with public links when the user doesn't have enough permisssions

* Properly expire ext storage versions

System-wide external storages have no real owner so the current user is
used as owner. However when running cron.php there is no current user,
so no expiry can be done.

This fix adds an user argument to the expire() function to tell for
which user to expire files. This information is anyway always available
now through the expire command job.

* Move version expire setupFS into the expire function

* Add comment about not tearing down in version Storage::expire()

* fixed size issues on main detail view and disappearing of share recipients

* Changes due to code comments

* Moved reloadProperties() to FileInfoModel

* Solved Scrutinizer issues

* Bugfix: undefined value used on error

* check if options are set for FileInfoModel.initialize()

* Style modifications of favorite star on main detail view

* Removed unused opacity change on mouse over

* favorite star title fixed

* favorite star opacity should  always be .7

Move files external to core