Switcheroo 0.3.0

• Add a Settings menu to the FF add-on with an option to enable the popup or to open links immediately in a browser.
• Fix Makefile make install failing if the native-messaging-hosts directory did not exist.
• Update python shebang to python3 to allow the script to work on Mint/Ubuntu machines.

https://gitlab.com/neilsimp1/switcheroo/-/releases/0.2.0

Added a menu when external links are clicked. Now you can choose to open in the app or in your browser.
Added some translations for this menu.