[NEW PORT] x11-themes/flat-remix-icon-themes: Flat Remix is an icon theme inspired by material design

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Summary

Flat Remix is an icon theme inspired by material design. It is mostly flat using a colorful palette with some shadows, highlights, and gradients for some depth.

https://github.com/daniruiz/flat-remix

Related to PR246608

Test Plan

Poudriere 12.1-Release amd64: Ok
Portlint: looks fine

Tested with Mate & XFCE

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Update to 20200710

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Update to 20201017

[tcberner]

this looks more like an upate, than a new port? ... he said, while looking at the diff of the diff like an idiot :D

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Committed in rP554852, thank you!