Pull SubCommands into libraries

[eljobe]

I'd like to make a command-line tool very similar in structure to the hetznerctl tool you have. But, it would have different SubCommand instances specific to the needs of my organization. It would be great to extract the definitions of the commands and the generic parts of the main function into libraries which would make it easy for my tool to use some of the same SubCommand instances, plus some new ones of my own design.

If you think this is a good idea, I'd be happy to provide you a pull-request refactoring the code for better reuse. (For now, I've just copied and pasted the parts I actually want from the hetznerctl tool.

Let me know.

[almereyda]

The subcommands could vaguely refer to the object types presented at https://robot.your-server.de/doc/webservice/de.html

Currently these are:

• [x] Server SetName, ListServers, ShowServer
• IP
• Subnet
• [x] Reset Rescue, Reboot
• [x] Failover Failover
• Wake on LAN
• Boot Configuration
• [x] Reverse DNS ReverseDNS
• Traffic
• SSH Keys
• Server ordering #15
• Storage Box #38
• Firewall
• vSwitch

of which some are already available here. A complete API client implementation could also profit from a Hetzner Robot OpenAPI definition, which does not seem to be available at this point.

8 will be helpful in patching things up here.