MakeNewDB ensures that a singleton instance of Database is returned per sqlite db file.

NotificationsEnabled - we should remove this and realated things once mobile team starts usign `settings_notifications` package.

Database sql wrapper for operations with browser objects.

SettingField represents an individual setting in the database, it contains context dependant names and optional pre-store value parsing, along with optional *SyncProtobufFactory.

Settings represents the entire setting row stored in the application db.

SyncProtobufFactory represents a collection of functionality to generate and parse *protobuf.SyncSetting.

SyncSettingField represents a binding between a Value and a SettingField.