Make an official Flatpak on Flathub

(#948) Feature Shipped packaging

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Comment by @spectrapulse
RexSystem 1 vote originally by @spectrapulse on GitHub
I'm unsure why anyone would want a flatpak as it always has been poor in terms of platform integration especially when there's prebuilt deb's and rpm's. If anything anyone should prefer a native package manager maintained version over flatpak but I can see how it might be a problem on immutable Distro's but those usually tend to have different solutions that are preferable. With that said, this doesn't mean there shouldn't be an unofficially supported flatpak, I just don't want to end up with a situation where a flatpak is the only option which does happen.