Add setting to disable offline notification

Alleviates #3300

Author: jacobmischka

packages/client-app/internal_packages/notifications/lib/main.es6

@@ -18,10 +18,13 @@ const notifications = [
   UnstableChannelNotification,
   DevModeNotification,
   DisabledMailRulesNotification,
-  OfflineNotification,
   UpdateNotification,
 ]
 
+if (NylasEnv.config.get('core.workspace.showOfflineNotification')) {
+  notifications.push(OfflineNotification)
+}
+
 export function activate() {
   ComponentRegistry.register(ActivitySidebar, {location: WorkspaceStore.Location.RootSidebar});
   ComponentRegistry.register(NotifWrapper, {location: WorkspaceStore.Location.RootSidebar});

packages/client-app/src/config-schema.es6

@@ -31,6 +31,11 @@ export default {
             'default': false,
             'title': "Use 24-hour clock",
           },
+          showOfflineNotification: {
+            'type': 'boolean',
+            'default': true,
+            'title': "Show offline notification popup",
+          },
           interfaceZoom: {
             'title': "Override standard interface scaling",
             'type': 'number',