* fix startup script for pyinstaller
* update 3rd party libs
* flatpak setup
* rely on requirements for pyqt6
* xcb fixes for linux binary build
* removed old linux build workflow
* add icon for MacOS based on icon_48x48.png
* add macos build script to build NanoVNASaver.app for current architecture
* add releas app action to build: NanoVNASaver.app-x86_64.tar.gz action