Add support for more browsers on Linux

[ghost]

Chromium-based:

• SlimJet
• Dissenter-Browser

Firefox-based:

• IceCat
• WaterFox

Some notes:

I removed Cyberfox because it is an outdated browser which hasn't been updated in several years. The remaining Firefox-based browser commented out to test are unavailable for Linux.

I also tested several browser which didn't work. I left them commented out with FIXME notations in case someone wants to look at them:

• SuperBird: This one had a lot of tracebacks, presumably it uses a different method for storing the passwords than standard Chromium-based browsers.
• Vivaldi & Whale: These are a little weird. They each (if included individually, or the last of both if you uncomment both of them) fail at this line. https://github.com/AlessandroZ/LaZagne/blob/f5425058102f18a643a5734eeef6a897af182e67/Linux/lazagne/softwares/browsers/chrome.py#L95
• Pale Moon: This is a browser based on an old version of Firefox. Perhaps the Firefox code we have only supports newer versions, or maybe they use a different method, but it doesn't work right now.

[AlessandroZ]

Awesome thanks !!