- Add `use Friendica\App;` wherever needed

Signed-off-by: Roland Häder <roland@mxchange.org>

---------------------
function bla (App &$a) {
	$a->bla = 'stuff';
}
---------------------

Signed-off-by: Roland Häder <roland@mxchange.org>

Signed-off-by: Roland Häder <roland@mxchange.org>

Signed-off-by: Roland Häder <roland@mxchange.org>

- count() returns very different results and never a boolean (not even false on
  error condition).
- therefore you should NOT use it in boolean expressions. This still *can* be
  done in PHP because of its lazyness. But it is discouraged if it comes to
  more clean code.

Signed-off-by: Roland Häder <roland@mxchange.org>

- Add Doxygen comment block for `nav_info()`
- Remove superfluous by-reference symbol and added type hinting to
`nav_info()` declaration
- More formatting

- Change "Edit Contact" link to "View Contact" in `include/Contact.php`
and `include/conversation.php`
- Add zrl parameter to public directory on single user instances
- Improved formatting of modified functions

This is now a user setting

Bugfix for adding tags to photos

* Added videos to usermenu
* Fixed alt for personal notes