Needed because we're using true OS threading, so we can't do the normal JSystem heap changing on thread change.
Requires encapsulating it (removing the public static field)
* move math to cmath
* replace stdarg to cstdarg
* change stdint to stdint.h
* minor fixes
* change stdio to cstdio
* change stdlib to stdlib
* renamed ctype to cctype
* fix missing argument for UNSET_FLAG
* Last fix for standard compiler error
* adding define guards around headers
* rename cmath.h and climits.h to cmath and climits respectively
* renaming cstdarg.h to cstdarg
* renaming cstdlib.h to cstdlib
* renaming cstring.h to cstring
* renaming cstdio.h to cstdio
* renaming cmath locale ctype
* renaming stdarg string and va_list
* renaming cstddef
* renaming stdio stddef stdlib
* renaming algorithm, functional, iterator, memory, and utility
* renaming bitset, cstdint, limits, and stdint
* renaming new and type_traits
* update quote includes for standard library headers to angle bracket includes
* Fix JUT_ASSERT to be a nested define
* Switch names that appear in asserts to be constants instead of defines
* Replace `0` in asserts with `NULL` or `FALSE`
* Fix fpclassify
* Fix ARRAY_SIZE
* Use G_CM3D_F_INF
* More fixes for fpclassify
* Remove FLOAT_LABEL
* Remove incorrect FLAG_ON macro
* Remove UNK_BSS macro
* Silence clangd unused header warning for PCH
Jeffrey Crowell