Version 1.6.0

Added an access report (scans, unique visitors, and last scan per QR code by period, with CSV download)
Added the scan count to the QR code column of the post and user lists
Added a sidebar widget that shows the QR code of the current page
Added a “Settings” link to the plugin list
Changed the redirect to 302 so that repeated scans are recorded and changes to the destination take effect (301 was cached by browsers)
Fixed redirect codes matching unrelated QR codes when the code contained “_” or “%”
Fixed event QR codes ignoring the site time zone
Fixed empty fields being included in contact (MeCard / vCard) and event QR codes; vCard now includes the required FN field
Fixed backslashes being removed from QR code data when saving
Fixed the [qrcm] shortcode showing a broken image for posts whose QR code had not been generated yet
Fixed the plugin doing nothing until the settings were saved once
Fixed a fatal error on the list screen when the QR code data was too long to fit in a QR code (a message is shown instead)
Fixed a margin of 0 being ignored, and the “Top text type” of the background image editor not being saved or previewed
QR code images are now regenerated only when the data or settings change (previously on every list page view)
QR code image files are deleted when the post or user is deleted
Downloading a QR code now requires permission to edit the post or user