* wip: array reduce and any/all
* wip: continue adding more functional-like array module functions
* wip: documentation and other fixes
* finish unit tests, require INDEX variable in lambdas, ready for first review
* don't worry about iterating by ref (it wasn't passing it that way anyhow)
* update release notes again
* simplify, remove "summary operators" and related tests
* Use more $defined, remove "has_operator". Fix regression in `$defined(var $f = 123)`
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Co-authored-by: Christoffer Lerno <christoffer@aegik.com>
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