A set of fixes and upgrades

* writeToDownloads: Add missing await
* Remove window.isFocused() - not used anywhere!
* Update typescript, p-queue, make necessary changes to fix build
* Slow down sender certificate retries with no existing cert
* Slow down signed prekey refreshes when unlinked - 5s -> 5m
* Update protobufjs to 4.1.2

app/sql_channel.js

@@ -1,5 +1,5 @@
 const electron = require('electron');
-const Queue = require('p-queue');
+const Queue = require('p-queue').default;
 const sql = require('./sql');
 const { remove: removeUserConfig } = require('./user_config');
 const { remove: removeEphemeralConfig } = require('./ephemeral_config');