feat: CAPTCHA functionality

bin/controls/Captcha.js

bin/controls/CaptchaDisplay.js

bin/controls/modules/Google.js

bin/controls/settings/CaptchaSelect.js

locale.xml

settings.xml

src/QUI/Captcha/AbstractCaptcha.php

src/QUI/Captcha/CaptchaInterface.php

src/QUI/Captcha/Controls/CaptchaControl.php

src/QUI/Captcha/Controls/CaptchaDisplay.html

src/QUI/Captcha/Controls/CaptchaDisplay.php

src/QUI/Captcha/Exception.php

src/QUI/Captcha/Handler.php

src/QUI/Captcha/Modules/Google.php

src/QUI/Captcha/Modules/Google/Control.php