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Split XpartaMuPP and EcheLOn into separate directories and rename parent folder…

Description

Split XpartaMuPP and EcheLOn into separate directories and rename parent folder to "lobbybots" following rP18609.

Yields a more transparent directory structure, in particular when adding the third bot or systemd service files.

Refs: #3022, D1659, D1661.
Comments by: user1, Dunedan