Simplify the license client integration

[mahlamusa]

Currently, the client integration puts all the code into class-slswc-client.php, and that's almost 3000 lines of code. It's not easy to read and maintain, so, this code needs to be refactored into separate classes in separate files.

[image: 2022-02-17 @ woo-aftee-payment.pot — afteemuj [SSH 178.128.103.9]-000110.png]

The following should be possible without breaking the integration:

• If someone doesn't need the client manager, they don't need to include the client manager class file.
• License client should work without the Client Manager class

Convert to composer package: #9

Additional context