[PATCH] Refactor some operations in <string>

[Marshall Clow]

Hoist a bunch of routines in <string> from member functions into inline stand alone functions, and have the member functions call them.
No functionality change intended.
The reason for this change is that the proposed <string_view> class has a very similar interface, and needs all the same functionality.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki
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