Add user and permission system

Add users, roles and permissions and rework the authentication to use
separate user and slave tokens for control and slave connections
respectively.

Add commands for listing permissions, roles and users, and creating,
editing and deleting roles and users.

plugins/subspace_storage/master.js

@@ -30,7 +30,8 @@ const masterInventoryGauge = new prometheus.Gauge(
 class MasterPlugin extends plugin.BaseMasterPlugin {
 	async init() {
 
-		let root = this.master.config.get("master.web_root");
+		let externalAddress = this.master.config.get("master.external_address");
+		let root = externalAddress ? new URL(externalAddress).pathname : "/";
 		this.ui = {
 			sidebar: [
 				{

plugins/subspace_storage/routes.js

@@ -1,7 +1,6 @@
 const express = require("express");
 const path = require("path");
 
-const authenticate = require("lib/authenticate");
 const prometheus = require("lib/prometheus");