add icesugar_pro platform file from #197#198

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ryankurte wants to merge 1 commit intoamaranth-lang:mainfrom ryankurte:icesugar-pro

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Commits on Apr 21, 2022

Add icesugar_pro platform file from amaranth-lang#197 , also pin markupsafe version to avoid pallets/markupsafe#282
ryankurte
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