* Major overhaul of swap UI, preparing for rewrite

* Show "Undo" after swiping away items from the "Updates" tab (thanks @Hocuri!)

* Fix ETag handling when connecting to NGINX mirrors #1737

* Fix issues with "Latest" display caused by mishandling time zones #1757

* Ignore all unimportant crashes in background services

* Do not use Privileged Extension if turned off in "Settings"
