Replace all static model methods. Support dependency injection for all models. Clean up things that used the static model methods. Decouple ConfigModel and CssModel. Reviewed-on: https://gitea.subcultureofone.org/greg/tkr/pulls/52 Co-authored-by: Greg Sarjeant <greg@subcultureofone.org> Co-committed-by: Greg Sarjeant <greg@subcultureofone.org>