Support self-contained Windows compiler toolchain

This will need to be accompanied by the publication of my toolchains
repo at some point which has scripts to set up fixed versions of MSVC
and LLVM, with way less space wasted than the official distributions
thereof. Also that'll become necessary for a period of time until I
figure out why LLVM 22 and 23 are unable to link SST now; we are stuck
on 20 for the foreseeable future which makes having a self-contained
thing quite helpful.

This change also includes a couple of other build script improvements
too, most notably debug builds without having to edit the damn script
every time.

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