LOOM-MEMORY: jemalloc and various Ben + Josh work herein be

I have tested this out on OSX, iOS, Android, and Windows with live reload, etc.  The only bit that I readily see as an issue is that on Android/Win32 the jemalloc stuff is wrapping system malloc/free/realloc.  So, some thoughts on that would be good... otherwise, this is all up to date now, tested, compiling on Windows with yet more "MSVC compatibility" for standard C/C++ stuff on other compilers and ready for some prying eyes,  much of it being Ben's handiwork and a fair amount of the pull being jemalloc itself