API - CRUD for peers, interfaces and users (#340)

Public REST API implementation to handle peers, interfaces and users. It also includes some simple provisioning endpoints.

The Swagger API documentation is available under /api/v1/doc.html

frontend/src/helpers/models.js

@@ -146,6 +146,8 @@ export function freshUser() {
     Locked: false,
     LockedReason: "",
 
+    ApiEnabled: false,
+
     PeerCount: 0
   }
 }