tornelib-php-crypto

* Switched all function controls to use Security::getCurrentFunctionState - this makes it easier to check if functions really are available.
* Checking openssl vs mcrypt vs PHP >=7.1/<=7.0 availability. Will throw execeptions if openssl is absent and mcrypt is present in PHP 7.1 platforms.
* Updated compression class.
* Added docblocks.
* Added minor test to check openssl presence.