APITests tries to load files from absolute paths

[tjltjl]

Thank you for Picogk!

After successfully building on macos:

mkdir build; (cd build; CXXFLAGS="-Wno-missing-template-arg-list-after-template-kw" cmake .. && make -j 16)

I ran APITests. The output is a bit concerning:

PicoGK Core Library 1.7.1
2025-04-21 16:17:49 picogk
Failed to load STL from/Users/richard/PicoGK_TestFiles
Failed to load viewer textures from /Users/richard/PicoGK_TestFiles
Failed to save Vdb to /Users/richard/PicoGK_TestFiles
Failed to read Vdb from /Users/richard/PicoGK_TestFiles

-- it's trying to read files from an absolute path.

This is explained by APITest/main.cpp:

#define TESTFILE_PATH "/Users/richard/PicoGK_TestFiles"

but no source for the files is given.

It would make reuse of this module simpler to have the testfiles available e.g. as a git submodule and having the loading just work.

Also, I notice that APITests tries to write to the testfiles - that doesn't sound like a robust way of doing things.