Add support for several waterfalls.

package-lock.json

package.json

src/lib/components/latchkeys/Arrow.svelte

src/lib/components/latchkeys/AxisY.svelte

src/lib/components/latchkeys/Latchkey.svelte

src/lib/components/parameters/ValueAtInstantEdit.svelte

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

src/lib/components/test_cases/TestCaseView.svelte

...ib/components/variables/VariableReferredInputsPane.svelte

src/lib/components/waterfalls/Waterfall.svelte

src/lib/decompositions.ts

src/lib/server/decompositions.ts

src/routes/__layout.svelte

src/routes/index.svelte

src/routes/variables/[variable]/inputs/[date].json.ts