Uladox/fn85: File name in base 85 (from arbitrary bytes) library.

Uladox c2f747abe9 Switches ( and ) out for [ and ]		6 lat temu
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Makefile	0175253a2e Adds fn85_hex tool.	7 lat temu
fn85_hex.c	c2f747abe9 Switches ( and ) out for [ and ]	6 lat temu