focus-new-window@mdpenguin: add exclude list setting

[ChrisB85]

Allow users to specify programs whose windows should not receive focus.

In my case, the extension works correctly with all applications except https://flathub.org/en/apps/com.github.IsmaelMartinez.teams_for_linux, where every message notification caused the application to come into focus. The list of excluded applications solves this problem.

[rcalixte]

cc @mdpenguin

[mdpenguin]

This looks useful but I'd prefer to see the following before merging the changes:

• Add "dependency": "!raiseSome" to the new setting so that it only shows when "Raise windows only of listed programs" is not selected.
• Rephrase tooltip to "Comma separated list of programs that should not have their windows automatically receive focus" so that it's not implied that users can't click on the window to give it focus.
• Update the Options section of Readme.md as follows:

## Options
- Raise window only of listed programs
    - When selected, only windows from the programs that you list will be affected by the extension
    - When unselected, windows from all programs will be affected by the extension unless included in "Programs to exclude"
- Programs to include
    - A comma separated list of programs to include
    - The list is not case sensitive and spaces between programs is optional
- Programs to exclude
    - A comma separated list of programs that should not have their windows automatically receive focus
    - The list is not case sensitive and spaces between programs is optional

[ChrisB85]

@mdpenguin I made the requested changes and improved the logic so that the include/exclude lists are used depending on the raiseSome setting.

[mdpenguin]

Thanks for making those changes. I'm fine with it as it is, but it might be better to change both the setting element and variable from programList to includeList so that it's consistent and clearer to anyone who works on this in the future.