[Services] First steps to integrate dynamic settings change
[Website] Don't automatically build the webforms-site anymore

The site will be phased out (just like the PHP-one). It is kept around for migration and will eventually be deleted one day.
[Settings] Added attribute to describe whether settings require a restart of the service to take effect

This has two reasons:
1. Give us (the devs) more time to update the settings, and also allows to keep track of progress
2. Make clear to the user that some settings may not take effect immediately and require a restart

Applied the attribute to the address book and engine, which mostly allow a seamless settings change.
[Config UI] Displays which settings are dynamic

Displays which settings require a service restart to take effect and which ones are applied immediately. This is to aid the user in knowing what takes immediate effect and what not.