Dynamic DNS Update

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- Added the option to only update when the IP changed compared to the previous update

- Added more DDNS Services
- Added the option to check certificates for secure (https) ddns updates
- Added the option to start the server directly when the app starts (and wasn't running in the background)
- Fixed bugs which should solve stability issues of the servers
- Added the option to save the server settings to the sdcard to prevent removal during upgrades
- and more!