Bug report: HostServicesFactory on Linux needs a more complete browsers list

[Mike Hearn]

The file HostServicesFactory.java (I cannot find it in the JFX8+ repo)
contains this line of code, for Linux. It should be re-arranged and
extended for better compatibility:

- static final String[] browsers = new String[]{"google-chrome",
"firefox", "opera", "konqueror", "mozilla"};

+ static final String[] browsers = new String[]{"xdg-open",
"gnome-open", "google-chrome", "chromium", "firefox", "opera",
"konqueror", "mozilla"};