Refactor Is class

[Mte90]

There are various and better ways that can remove this code from a boilerplate (https://github.com/WPBP/WordPress-Plugin-Boilerplate-Powered/blob/master/plugin-name/engine/Is_Methods.php) to an external library.

• https://github.com/j-arens/wp-context/ - This one is very old and not updated
• https://github.com/szepeviktor/Toolkit4WP/blob/master/src/Is.php#L66-L119 - Include more context
• https://github.com/inpsyde/wp-context - This one seems the best one

An idea can be create a wrapper to one of those and remove more code to be tested as it is delegated to the library.

PS: maybe change the name of the class as it is not allowed to have one of just 2 like Is so I added methods but is very horrible.