SPDX License & add a missing dependency
➜ ~ flowblade
FLOWBLADE MOVIE EDITOR 2.14
---------------------------
Launch script dir: /usr/bin
Running from installation...
modules path: /usr/lib/python3.11/site-packages/Flowblade
MLT found, version: 7.22.0
Failed to import module app.py to launch Flowblade!
ERROR: No module named 'usb1'
Installation was assumed to be at: /usr/lib/python3.11/site-packages/Flowblade