Minor updates
Minor updates

- two options for button 3
- save files in a sub-folder
- option to delete files from previous events

varunmehta/photobooth,werdeil/pibooth,CaptFennec/photobooth,PedroAmorim/Photobooth,drumminhands/drumminhands_photobooth,werdeil/pibooth,DanTheBlue/drumminhands_photobooth,varunmehta/photobooth