Add Discord Rich Presence to Cytopia

[lizzyd710]

What the title says basically. However, if anyone has any ideas as to what they want featured on the rich presence feel free to comment. I figure we probably want our logo on their in some way, and maybe also time spent in game.

Library: https://github.com/discordapp/discord-rpc

[AnotherFoxGuy]

Conan package: https://artifactory.anotherfoxguy.com/ui/packages/conan:%2F%2Fdiscord-rpc/3.4.0?name=discord-rpc&type=packages&activeTab=builds discord-rpc/3.4.0@AnotherFoxGuy/stable

[SimplyLiz]

This library has been deprecated in favor of Discord's GameSDK. https://discordapp.com/developers/docs/game-sdk/sdk-starter-guide

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@AnotherFoxGuy Could you provide a conan package for Discord GameSDK instead of the deprecated library?