Add a new `abspath(path)` function to the add-on, for use in job type settings. With this, the "simple blender render" job can support relative paths for the "render output root" setting, and still have an absolute final "render output path".
{ffmpeg}
os.IsNotExist()
errors.Is(err, fs.ErrNotExist()
assert.NoError()
assert.Nil()
job_compilers/path.go
js_path.go
job_compilers/process.go
js_process.go