String#trim(chars)

[Michael DeByl]

Generally `trim()` will only operate on the start and end of the strings
(also why `trimLeft()` and `trimRight()`.



All that needs to be done is allow specifying a string or array of
characters to trim as an argument – which should not break anything as the
`trim()` method currently accepts nothing. If nothing specified, use [\r,
\n, \t, ‘ ‘] – or whatever it currently does as to once again not break
anything.



As a sidenote; traditionally `trim` will use text transforms first from the
start, and then from the end of the string. I’m not sure in JS if a regex
is faster, or if it even matters overall.



-Michael
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