#746 Allow String search methods' "needle" arguments to be lists

[Erich]

It would come handy if various String methods which require search "needle" arguments, in addition to a string needle also accepted a list (an Array) of needles, like

-- is this a JPEG file?
if s~caselessEndsWith((".jpg", ".jpeg") then ...

The list should be interpreted as OR or ANY OF.

Affected methods could include startsWith, endsWith, contains, containsWord, pos, lastPos, countStr and their respective caseless variants.

[Rick McGuire]

I only have two reservations with this:

1) While useful, I think as a practical matter one would also want to know which item is a hit.
2) Argument processing rules can get a bit dicey because strings and arrays are symmetrical with request('String') and request('Array')