* Import cxxopts to replace getopts usage
* Add visual studio build things
* Fixup abseil build parts
* Replace __attribute__((unused)) with ABSL_ATTRIBUTE_UNUSED
* Fixup minor windows build issues
* Replace getopts usage
* Temporarily fixup .rc files
* More minor windows fixes
* Get a working build
* Revert .rc files
* Revert changes to nodedb
msys2 grabs its reactos sdk headers straight out of git
most cross-compilers use the versioned releases (v6 as of last week)
huh. for once setting the windows version macros doesn't break anything.