1.4.0 New baseline version using namespaces

This is a new baseline version for future maintenance & development of COPS on PHP 8.x

Main changes include:

• the systematic use of namespaces for the COPS library classes,
• introducing a Request class to hold the current request information, and
• removing dependency on global $_GET in most of the COPS library.

There are still a few dependencies that need to be changed, especially on the current URL endpoint and language localization.

Full Changelog: 1.3.6...1.4.0