With this, we are able to get rid of all the increasingly broken file
system utility code, and trust std::filesystem to handle all the cross-
platform complexity.
Unfortunately std::filesystem support remains a little elusive; it is
well supported in Visual Studio (especially 2019), but not by default
in Mac OS X, and even in GCC 8.0 it requires an explicit '-l c++fs'.
This also silences some of the more egregious compiler warnings, mostly
by being explicit about where we cast to the uint32 types glTF prefers.
Did not mean to commit/push the current state of master. But rather than
mess up source control history with a force push, I'll just try to hurry
to a stable point.
Par Winzell
Pär Winzell