Rename Slave to Host

The role of a slave as a host for Factorio servers is not well reflected
in its name and has caused confusion among users.  Rename slave to host
to better reflect its role as a host of Factorio servers.

plugins/player_auth/README.md

@@ -12,7 +12,7 @@ Run the following commands in the folder Clusterio is installed to:
     npm install @clusterio/plugin-player_auth
     npx clusteriocontroller plugin add @clusterio/plugin-player_auth
 
-Substitute clusteriocontroller with clusterioslave or clusterioctl if this a dedicate slave or ctl installation respectively.
+Substitute clusteriocontroller with clusteriohost or clusterioctl if this a dedicate host or ctl installation respectively.
 
 
 ## Controller Configuration

plugins/player_auth/info.js

@@ -3,7 +3,7 @@ let { libConfig, libLink } = require("@clusterio/lib");
 
 
 class ControllerConfigGroup extends libConfig.PluginConfigGroup {}
-ControllerConfigGroup.defaultAccess = ["controller", "slave", "control"];
+ControllerConfigGroup.defaultAccess = ["controller", "host", "control"];
 ControllerConfigGroup.groupName = "player_auth";
 ControllerConfigGroup.define({
 	name: "code_length",
@@ -33,7 +33,7 @@ module.exports = {
 	messages: {
 		fetchPlayerCode: new libLink.Request({
 			type: "player_auth:fetch_player_code",
-			links: ["instance-slave", "slave-controller"],
+			links: ["instance-host", "host-controller"],
 			forwardTo: "controller",
 			requestProperties: {
 				"player": { type: "string" },
@@ -45,7 +45,7 @@ module.exports = {
 		}),
 		setVerifyCode: new libLink.Request({
 			type: "player_auth:set_verify_code",
-			links: ["instance-slave", "slave-controller"],
+			links: ["instance-host", "host-controller"],
 			forwardTo: "controller",
 			requestProperties: {
 				"player": { type: "string" },

plugins/player_auth/instance.js

@@ -18,7 +18,7 @@ class InstancePlugin extends libPlugin.BaseInstancePlugin {
 
 	async handleEvent(event) {
 		if (event.type === "open_dialog") {
-			if (!this.slave.connector.connected) {
+			if (!this.host.connector.connected) {
 				await this.sendRcon(`/web-login error ${event.player} login is temporarily unavailable`);
 				return;
 			}

plugins/player_auth/test/plugin.js

@@ -363,10 +363,10 @@ describe("player_auth", function() {
 				describe("open_dialog", async function() {
 					it("should call /web-login error if not connected to controller", async function() {
 						instancePlugin.instance.server.reset();
-						instancePlugin.slave.connector.connected = false;
+						instancePlugin.host.connector.connected = false;
 						await instancePlugin.handleEvent({ type: "open_dialog", player: "test" });
 						let command = instancePlugin.instance.server.rconCommands[0];
-						instancePlugin.slave.connector.connected = true;
+						instancePlugin.host.connector.connected = true;
 						assert.equal(command, "/web-login error test login is temporarily unavailable");
 					});
 					it("should call /web-login error after error from the controller", async function() {