Meshnet Permissions refactor

[MattsBos]

Current permission settings are quite ugly in code, also functionality is far from optimal.

Idea's:

• Make peer permissions more dynamic, less static. Iterate through nordvpn meshnet peer list
• Create an ENV var + code to BLOCK all services and peers on startup instead of configuring every single service.

Caveats:
Might be doing a lot of work for nothing as permission management will be available from the NordVPN account Meshnet WebUI. At the time of writing it's mentioned as an upcoming feature.