* Refresh ongoing task when setting up the background page.
* Add a button in the options to clear cached data.
* Fix typo that triggered task refreshes too fast in some cases.

* Save last used project to initialize creation form.
* Delete the list of task types from local storage every hour.

* Adapt to new error reporting features in phpreport server

* Review code flow when popup opens.
* Fix text in extension options dialog.
* Ping server every five minutes to keep session alive.

* Implement undo task deletion.
* Stop ongoing task when computer goes idle, not only when it's suspended.
* Also make idle timeout configurable, default is still 30 minutes.
* Refresh project list every hour.
* Convert background page to non-persistent.
* As an effect of this, ongoing tasks will persist across browser and extension restarts.
* Check ongoing task status right after login.
* Fix incorrect state when extension starts with ongoing task enabled.