Mark OLESEN authored Aug 25, 2023 and Andrew Heather committed Sep 01, 2023

- soft renames (ie, old names still available via typedefs) for more
  reasonable names and more coverage with std stream variants.

  The old names could be a bit cryptic.
  For example, uiliststream (== an unallocated/external list storage),
  which is written as std::ispanstream for C++23.

  Could similarly argue that IListStream is better named as
  ICharStream, since it is an input stream of characters and the
  internal storage mechanism (List or something else) is mostly
  irrelevant.

  Extending the coverage to include all std stream variants, and
  simply rewrap them for OpenFOAM IOstream types. This simplifies the
  inheritance patterns and allows reuse of icharstream/ocharstream as
  a drop-in replace for istringstream/ostringstream in other wrappers.

  Classes:
    * icharstream / ICharStream   [old: none / IListStream]
    * ocharstream / OCharStream   [old: none / OListStream]
    * ispanstream / ISpanStream   [old: uiliststream / UIListStream...