Auto-updater #15
Description
There should be a way for the plugin to auto-update since it is annoying to have to get people to update their servers every time.
The repository has been set up with automatic releases which means the plugin can simply grab and compare to the latest release.
The auto-updater should also consider an allow_auto_update convar and manage convar changes (since the plugin.offstyledb.cfg file won't update itself and there might be missing variables if an update introduces new convars)