fix: study ig view generation

Merge remote-tracking branch 'github/master'

chg: account for column "_label" in available char count

add: crf_version_oid to study ig's, sort crfv DESC

fix: broken stata_v11 zip when changing CRLF to LF

wip: re-write for various reasons, see test/todo.md

fix: escape invalid characters in multi-value column names

fix: create test output folder if it doesn't exist already

doc: update changelog, increment version

chg: clobber all null codes in non-string items

chg: minor improvements to test build scripts

chg: make formatting less whack

doc: update changelog

add: basic test script

chg: make demo even easier to do