Dark/Light Theme switch/toggle (with or without an accent color picker) in the app's settings

[drogga]

@zacharee Please add a theme switcher/toggle/selector between Dark/Light and maybe an additional Black (Amoled) one, maybe along with an accent color picker, or just a basic button in the settings like the one for bugsnag, it doesn't necessarily have to be anything fancy, because the app runs on A.7.0 (API/SDK 24) and newer, but there's no system theme toggle (tile) in OS versions before/below A.10, except maybe on Samsungs, which have it since A.8 or 9, and even above 10 not everyone has it on every system or prefers the app to be with the same theme as the system and many don't like the accent colors (tint - MaterialYou Monet thing - Example: A green tint in the screenshots) of A.12+ that gets applied to apps (can probably be changed with https://github.com/Mahmud0808/ColorBlendr or perhaps your Tweaker - I don't have an A.12+ system, so I currently don't care about the tint that much) or have a system preference for individual apps themes, like how A.13/14+ have (or at least Samsungs do), so I kindly request an independent from the system option in the app to change its theme.
Thank You.