Removed useless code

Signed-off-by: Jan Pecha <janpecha@email.cz>
Tests: added tests for global namespace syntax & simple combination syntax

Signed-off-by: Jan Pecha <janpecha@email.cz>
Added support for "(new|extends|implements) namespace\MyClass"

Signed-off-by: Jan Pecha <janpecha@email.cz>