soliplex-plumber v0.2: hoist installation editiong from `-concierge`

Features / Refactoring

• Hoist installation-editing from 'soliplex-concierge' [PR #1]

  ... fixing its #79 bugs as the code was ported.

  • 'sections' (new module) maps out sematncis of section types in a
    Soliplex installation configl

  • 'installer' (new module) provides mechanisms and a grammar for
    performing edits (adding entries) respecting those semantics.

  • 'rooms.install_room' and 'rooms.install_room_from' now take a required
    'parent_path', and ensure that adding a room is done cleanly, without
    e.g. hiding existing rooms or surfacing rooms which had been excluded.

  See: soliplex/soliplex-concierge#79