fix typo

defer -> differ
NEWS for 3.1.12
bump versions after release
try to make version compability on settingpage clearer
add a diagnostics view with more complete error messages
add diagnostic message when a key is inserted
add date to the diagnostic messages
add qualifier to usb errors.
force serial to a string in diagnostic message

otherwise we will call the wrong arg()
add an info diagnostics message with varios versions
more diagnostics for successful write-key operations
add touch level to key diagnostics
clear touchLevel when initing
make the diagnostics window non-modal
make the help pages non-modal

and make it a child of mainwindow and just send signals there when we
want it shown.
bump copyright
change the NDEF example to be the default string
don't use placeholder for the default neo url, just set it as text

and improve reset on Ndef page
NEWS for 3.1.13
bump versions after release