Implement captcha interface

Captcha interoperability interface using hook actionRegisterCaptcha

Version 1.1.3

• Fixed PHP 8.2 compatibility issue
• general code maintenance

Version 1.1.2

Fixed serious bugs #5 and #8 that prevented module from verifying captcha

Version 1.1.1

• fixed relative image url (css)
• removed G+ links
• properly remove overrides on module uninstallation

Version 1.1.0

• First release verified with the module validation system, so no more forgotten commits.
• Catch up on making releases. Looking at the repository history, development continued, but it was forgotten to make releases.

Version 1.0.2

• Maintenance release

Version 1.0.1

• Improve install by fixing multilang ObjectModel

Version 1.0.0

• Initial version