add icon
basically a svg version of the unicode train emoji
fetch data & generate qr code on separate thread
makes the app more responsive
add reload ticket functionallity
will automatically overwrite the file on disk with the updated data
if unsuccessful, nothing will be done
add delete button to ticket view
shows confirm dialog
onConfirm: removes file, closes ticket view and reloads home screen
set qr code size, so it force scrolls the page instead of collapsing
generate translation files
add GPL-3.0-or-later license