Formatting
README -> .md
Docstring syntax
Add isValidUtf8Prefix
Add isValidUtf8, add rejection of surrogate pairs, and update tests
Split out codepoint-io sig, mention stream in README
Merge from branch stream
Renaming
Add output stream
Fix load counting calculations
Fixes to satisfy SML/NJ
Add fromTextStream etc
Add first cut at instream that yields codepoints
Add "broken UTF8" test from "How many replacement characters?" (https://hsivonen.fi/broken-utf-8/)
Break out single codepoint to utf8 converter
Use dependencies script
Pull signatures inline, comment
Minor edit
Some renames
Docs