* Updating main branch for legacy libc++ support
* Adopting
* Removing unnecessary math header.
* Updating the single-header files so we can pass the new tests.
* Portable infinite-value detection is hard.
* Working toward disabling boost json selectively.
* Selectively disabling Boost JSON
* More work toward selectively disabling boost json.
* Remove our dependency on strtod_l by bundling our own slow path.
* Ok. Let us drop strtod entirely.
* Trimming down the powers to -342.
* Removing useless line.
* Many more comments.
* Adding some DLL exports.
* Let the gods help those who rely on windows+gcc.
* Marking the subnormals as unlikely. This is pretty much "performance neutral", but it might help just a bit with twitter.json.
John Keiser