Feature request: Refactor system settings #306

Is your feature request related to a problem? Please describe.

• Move settings to database.
• Update references to setting helper.

Feature request checklist

• This is a single feature (i.e. not a re-write of the entire CMS)
• The title starts with "Feature request: " and is followed by a clear feature name (Ex: Feature request: add konami code to control panel)
• I have searched for existing issues and to the best of my knowledge this is not a duplicate