Add support for custom decompositions.

example.env

package-lock.json

package.json

src/hooks.ts

src/lib/auditors/config.ts

src/lib/components/DecompositionTree.svelte

src/lib/components/NavBarAffairesSociales.svelte

src/lib/components/calculations/CalculationPane.svelte

src/lib/components/latchkeys/Arrow.svelte

src/lib/components/latchkeys/AxisY.svelte

src/lib/components/latchkeys/Latchkey.svelte

...lib/components/scholar_waterfalls/ScholarWaterfall.svelte

src/lib/components/waterfalls/Waterfall.svelte

src/lib/decompositions.ts

src/lib/server/config.ts

src/lib/server/decompositions.ts

src/lib/sessions.ts

src/routes/__layout.svelte

src/routes/dev/calculations.svelte

src/routes/simulation.svelte