Build the Windows client against the MSVC ABI while retaining clang
language support. Use vcpkg for ANGLE and libsamplerate, and build
MsQuic with its bundled static OpenSSL.
Keep warnings fatal for the GUI dependencies except for two known
issues in generated wrapper sources: an unused cimgui conversion helper
and cimplot's invalid internal FormatSpec conversion.
Scope the exceptions to their respective generated translation units so
warnings in ImGui, ImPlot, and the remaining wrappers stay fatal.
