added ability for onionshare_gui to alert messages, and made selecting filename less brittle
gui now handles NoTor successfully, and cleaned up business logic in both cli and gui
started web server in separate thread. organized file info, so it can be set from both cli and gui.
oops, changed order of set_file_info args
onionshare-gui automatically copies URL to clipboard
made a "Copy URL" button, and improved design
running async startup work in a separate thread, and design tweaks
default to not printing debug data