Rewrite plugin script collection using pathlib, avoid reading .pyc.
Rewrite plugin script collection using pathlib, avoid reading .pyc.

This was causing failures since the read operation would fail (.pyc are
bytes).

sheagcraig/sal,sheagcraig/sal,salopensource/sal,salopensource/sal,salopensource/sal,sheagcraig/sal,salopensource/sal,sheagcraig/sal