Fix STORAGE_* constants usage by moving those constants into \OC\Files\Filesystem.

As constants not defined within a class cannot be automatically found by the
autoloader moving those constants into a class makes them accessible to
code which uses them.

Signed-off-by: Stephan Peijnik <speijnik@anexia-it.com>
Use tabs for indentation.

Signed-off-by: Stephan Peijnik <speijnik@anexia-it.com>
move to public namespace
fix typo
Add doc for \OCP\Files\FileInfo space constants
Merge pull request #10518 from owncloud/fix_storage_const_autoload

Fix storage const autoload