Refactor telemetry system to be more secure and GDPR compliant (WIP; not tested)

_tests/tests/async_tests/telemetry.php

adminzone/pages/modules/admin_privacy.php

adminzone/pages/modules/admin_version.php

adminzone/pages/modules_custom/admin_telemetry.php

data/installed.php

install.php

lang/EN/installer.ini

lang/EN/privacy.ini

lang_custom/EN/cms_homesite.ini

pages/modules_custom/telemetry.php

sources/encryption.php

sources/failure.php

sources/global3.php

sources/hooks/systems/addon_registry/core_privacy.php

sources/hooks/systems/config/telemetry.php

sources/hooks/systems/config/telemetry_may_feature.php

sources/hooks/systems/page_groupings/core.php

sources/site.php

...custom/hooks/blocks/main_staff_checklist/cms_homesite.php

sources_custom/hooks/endpoints/cms_homesite/newsletter.php