Import into vfs

1. send file/send photo/take pic/record audio  - import into vfs and offer from there
2. end/delete chat - prompt to clear vfs
3. if "take pic" or "record audio" we should auto-delete the source file, and/or prompt the user "do you want to delete the original file (yes/no/always)"?

Note: work in progress. All functionality works, but needs some cleanup.