2023-06-05

• zlib updated to 1.2.13.
• new mem::ComplexView class to make it easier to process complex data stored in parallel.
• adjust compiler flags for clean CMake builds.
• wrap common "file open" routines (e.g., fopen()) to support sys::expandEnvironmentVariables().
• add header-only HighFive HDF5-wrapper library.
• Added a handful of HighFive utility routines.
• mt::transform_async() removed, it doesn't match C++17 techniques.'
• Revamp sys::byteSwap() for improved type-safety and
  better performance.
• Added case-insensitive string comparison utilties: str::eq() and str::ne();
  xml::lite::Uris compare case-insensitive.