Settings Refactor

[jguerinet]

• Cleaned up all code that is accessible from the Settings except for the walkthrough (settings, about, help, EULA)
• Clean up the about section by removing the roles under each person
• Removed useless FAQs
• Switched the beta tester Url to the one from the Google Play Store
• Switched some of the layouts to ConstraintLayout

[jguerinet]

With regards to your note:

• I haven't set up ProGuard yet, it's a bridge to cross in the near future.
• It was originally using enums with fully resolved Ids, but given that it's so repetitive and follows the same exact format, I switched to this in this PR. When ProGuard becomes a thing, if this is problematic I'll revert back to using enums.

[AllanWang]

enum would be something like this:

enum class Person(val aboutRes: Int, val iconRes: Int, ...) {
    JULIEN(R.string.about_julien, R.drawable.about_julien, R.string.about_julien_role,
                R.string.about_julien_email, R.string.about_julien_linkedin),
    XYZ(...)
}

and you would add items through Person.values().map {...}.

If you have subcategories you can add extra values to denote the categories. It isn't too verbose in the sense that every value you write has meaning, and it's safer than getting resources by name.

[jguerinet]

All right all right, I'll add the enums back.