Add save listing and subscriptions

Add link messages for listing saves and listening for changes to the
list of saves for instances along with a table in the instance view page
showing the save list for the instance and a list-saves command to ctl.

packages/master/src/ControlConnection.js

@@ -43,6 +43,11 @@ class ControlConnection extends BaseConnection {
 			instance_ids: [],
 		};
 
+		this.saveListSubscriptions = {
+			all: false,
+			instance_ids: [],
+		};
+
 		this.logTransport = null;
 		this.logSubscriptions = {
 			all: false,
@@ -326,6 +331,19 @@ class ControlConnection extends BaseConnection {
 		}
 	}
 
+	async setSaveListSubscriptionsRequestHandler(message) {
+		this.saveListSubscriptions = message.data;
+	}
+
+	saveListUpdate(data) {
+		if (
+			this.saveListSubscriptions.all
+			|| this.saveListSubscriptions.instance_ids.includes(data.instance_id)
+		) {
+			libLink.messages.saveListUpdate.send(this, data);
+		}
+	}
+
 	async setLogSubscriptionsRequestHandler(message) {
 		this.logSubscriptions = message.data;
 		this.updateLogSubscriptions();