Disable long functions/objects/classes usage

[wppunk]

Description

Basically, use the use statement instead of a long declaration.

• [ ] Don’t use the backslash for functions. Skip micro-optimization. \func( ... ) or \DateTime( ... ) - are incorrect.
• [ ] Validate that file hasn't unused use statements

Tested code

Incorrect:

namespace Test;

\func( ... )
\some\namespace\func2( ... );
\DateTime( ... )
\Some\Name\Space\Example()
\Some\Name\Space\Example2::class

Correct:

namespace Test;

use Some\Name\Space\Example;
use Some\Name\Space\Example2;

use function some\name\space\func2;

func();
func2();
DateTime();
Example::class;