Various fixes for converting cp1252, cp1251, cp1250 characters to and from utf-8#1288

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Lord-Nightmare wants to merge 3 commits intonwnxee:masterfrom

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Commits on Mar 14, 2021

Commits on Mar 22, 2021

Update as suggested to use 0x80-long tables for all three supported codepages, and fixed FromUTF8 to also search the entirety of these tables.
Lord-Nightmare
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