The array query APIs now all do:

  - Return the total number of items
  - Take a start_offset, such that individual items can be fetched
  - The _count IN/OUT variable always has number of items written
    into the array upon return of the function

Separate OT headers also.

Such that we don't link to libstdc++.

It's not part of the standard and MSVC doesn't like it.  It makes the code
a lot less elegant than it used to be, but I think it should work now.

Thready-safety disabled in that case, until we add support for pthread, etc.
Fun...