collection of fixes for building without pre-compiled headers #1672
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Description of Change(s)
ie, if -DPXR_ENABLE_PRECOMPILED_HEADERS=OFF
wanted to build without precompiled headers to help with debugging a
strange build issue (ie, create more transparent + atomic build steps)
also, turning off PCH usage allows stashed.io (a
caching compiler wrapper for MSVC) to operate when using PDB
(see: https://github.com/playscale/stashed.io/wiki/PDB-and-PCH-generation)
most fixes are pretty self-explanatory - adding some missing headers to
individual source / header files
in stackTrace.cpp, the include of Winsock2.h must happen before windows.h,
which is brought in via fileSystem.h