* Provide mechanism for config to override global settings
* Ensure overrides are observed on save
* Refactor
* Add "read_only" field to serializer
* Prevent editing for read_only settings
* Bump API version
* Update docs
* Secure logs
* Override applies to default_value
* override get_setting method
* Add unit test
* Utilize new approach to override SITE_URL
* Docs updates
* Docs tweaks
* Shortcut for get_global_setting
* Remove previous change
- Allow validation to be performed within the InvenTreeSetting class
* Override INVENTREE_BASE_URL setting
* Handle error on worker boot
* Tweak unit test
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