Major Feature: Volatile Support

• Glaze now supports volatile qualifiers. This was added for proper serialization/deserialization of hardware registers.
• This volatile support includes glz::meta reflection and pure reflection.
• glz::volatile_array has been added under glaze/hardware/volatile_array.hpp
  • glz::volatile_array has the same API as std::array, but uses volatile memory and provides volatile methods
• JSON pointer syntax access also supports volatile.

When reading into arithmetic types, we parse into a temporary and then assign, this ensures that side affects from hardware looking at variables will not occur until the parse has completed and the assignment is made.

by @stephenberry in #885, #886, #890, #891

More New Features

• binary support for glz::merge by @stephenberry in #889 (thanks @fregate)
• support for std::filesystem::path by @stephenberry in #892 (thanks @dbraeckelmann)

Full Changelog: v2.3.3...v2.4.0