This was just rather useless level of abstraction. I heard from other
devs that these helper classes caused confusion, so better to avoid
this.
Now the asset representation has all the needed bits to create its full
path, blend-file path and asset library relative path. In fact only the
asset library relative path needs to be stored to make all this
available, since the asset representation already stores a reference to
the asset library owning it, so the paths can be recreated easily.
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