Adding TWINT payment method

Thanks to @Axent96 for adding this!

Updated SHA-OUT parameters filter

Thanks to @SiddhyN to notice this possible optimization, and thanks @toooni for testing this before release!

Status for pending cancellation of authorization

Thanks @toooni again for this little one!

New PSR level and updated from Marlon Ogone library

Thanks to @toooni for his work to update this lib.

You will find a new PSR-4 autoloading and all the updates from the original @marlon-be library.

Completely switch to PostFinance namespace

This release is to completely switch from Ogone namespace to PostFinance one.