Small collection of vcpkg triplets

pass the parameter --overlay-triplets=<relative-or-absolute-path-to-checkout> to vcpkg install or
set/append <relative-or-absolute-path-to-checkout> to VCPKG_OVERLAY_TRIPLETS in cmake when using the vcpkg toolchain.

x64-linux-dynamic-release: A release only x64-linux-dynamic triplet

x64-windows-llvm(-static|-release): First generation windows triplets using (mostly) llvm with static library linkage.

x64-win-llvm: Next generation of windows triplets using (mostly) llvm.
x64-win-llvm-lto: x64-win-llvm with LTO enabled in release builds (LTO only works with release build flags)
x64-win-llvm-san: x64-win-llvm with Sanitizers enabled in release builds (Sanitizers only work for release builds due to LLVM not shipping the libs build against the debug CRT)
x64-win-llvm-lto-san: x64-win-llvm with LTO and sanitizers enableded (only for release)
x64-win-llvm(-lto)?(-san)?-static(-md)?: Same as the above triplets but with static library linkage (and dynamic CRT linkage if -md); -san without -md is unsupported due to limitations of the meson build system.

<above-triplet>-rel(ease)? : Release only variant of the triplet

Currently the intriscs headers of clang are not unconditionally including the sub intrinsics like e.g. the avx intrinsics. This is different from MSVC where all intrinsic function the compiler supports are available. Changing the clang behavior requires editing the intrinsic headers located at <llvm-root>/lib/clang/<llvm-version>/include to unconditionally include the other intrinsics. See llvm/llvm-project#53520 for more infos. This code change to the headers is required to e.g. compile qt with clang-cl.