[vcpkg] Add initial JSON support (#10521)

* [vcpkg] Add initial JSON support

This adds a JSON parser, as well as the amount of unicode support
required for JSON parsing to work according to the specification. In the
future, I hope to rewrite our existing XML files into JSON.

Additionally, as a drive-by, we've added the following:

* add /wd4800 to pragmas.h -- this is a "performance warning", for when
  you implicitly convert pointers or integers to bool, and shouldn't be
  an issue for us.
* Switched Parse::ParserBase to read unicode (as utf-8), as opposed to
  ASCII
* Building again under VCPKG_DEVELOPMENT_WARNINGS, yay!

0 files changed, 0 insertions, 0 deletions