* add quad9 as new doh provider
* add ipv6 addresses to google doh
* revert changes to import
(cherry picked from commit d8c8d7c58853c28adb36b2398b5bc65b6b1b9374)
# Conflicts:
# app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAdvancedController.kt