Modify UI/UX

Bug 40015: Modify Home menu

Bug 40016: Hide unwanted Settings

Bug 40016: Modify Default toolbar menu

Bug 40016: Add Donate settings button

Bug 40016: Move Allow Screenshots under Advanced

Bug 40016: Don't install WebCompat webext

Bug 40016: Don't onboard Search Suggestions

Bug 40094: Do not use MasterPasswordTipProvider in HomeFragment

Bug 40095: Hide "Sign in to sync" in bookmarks

Bug 40031: Hide Mozilla-specific items on About page

Bug 40032: Set usesCleartextTraffic as false

Bug 40063: Do not sort search engines alphabetically

Bug 34378: Port external helper app prompting

With the corresponding android-components patch, this allows all `startActivity`
that may open external apps to be replaced by `TorUtils.startActivityPrompt`.

Bug 34403: Disable Normal mode by default

Bug 40087: Implement a switch for english locale spoofing

Bug 40144: Hide Download Manager

Bug 40141: Hide EME site permission

Bug 40166: Hide "Normal" tab (again) and Sync tab in TabTray

Bug 40167: Hide "Save to Collection" in menu

Bug 40172: Find the Quit button