This was fixed in H-uru/libhsplasma#242 originally, but Win32 APIs seem
to have terrible performance without user mode buffering, which
negatively impacted PRP loading in other tools, such as PRP Shop.
Therefore, the fix was reverted in H-uru/libhsplasma#246. This fixes the
race condition closer to the point of impact using the Win32 stream
introduced by H-uru/libhsplasma#264.
I don't really remember why we initially used WiX. Possibly to silently
update any existing Blender installs? Anyway, the problem is that the
VCRuntime MergeModules are deprecated, and GHA has pretty much removed
them. So, we need to use NSIS to be able to trivially run the
vc.redist.exe installer. It runs an MSI, and WiX produces MSIs, so to
keep using WiX, we'd need to write an installer-coordinator. Forget
about it. Just use NSIS.
This will allow us to automate releases with the Blender 2.79
"experimenntal nightly" codebase. This is great because the newer
Blender uses Python 3.7 (instead of 3.5). This pulls from my fork of
Blender, which has a number of build improvements added on top.
