Move \OCP\L10N to PSR-4

Move FederatedFileSharing to PSR-4

Allow chunk GC mtime tolerance for unfinished part chunks

Remove author from libreoffice templates

Move \OCP\Http to PSR-4

a single token provider suffices

Move \OCP\Files to PSR-4

Whenever part chunks are written, every fwrite in the write loop will
reset the mtime to the current mtime. Only at the end will the touch()
operation set the mtime to now + ttl, in the future.

However the GC code is expecting that every chunk with mtime < now are
old and must be deleted. This causes the GC to sometimes delete part
chunks in which the write loop is slow.

To fix this, a tolerance value is added in the GC code to allow for
more time before a part chunk gets deleted.

* Fixed dynamic group ldap access

getUserGroups:
Using $userDN instead of $uid to query LDAP
Converting groupDN to group name using API instead of substring
Removing cache processing at the end of the method

* Fixing group handling

added back the cache processing and fixed

* fixed possible indention problem

spaces -> tab conversion

* formatting, white-space changes only

* Move \OCP\DB to PSR-4

* Fix PHP doc

run upgrades in incognito mode

* Move used OC_Group_xx to \OC\Group

* Add (deprecated) legacy wrapper in legacy, OC_Group_xx

* Replace deprecated use of OC_Group_xx with \OC\Group\xx