Add ESLint and remove linting errors.

.eslintrc.cjs

.prettierignore

package-lock.json

package.json

src/hooks.ts

src/lib/ParametersNode.svelte

src/lib/auditors/config.ts

src/lib/auditors/responses.ts

src/lib/config.ts

src/lib/decompositions.ts

src/lib/session.ts

src/lib/simulations.ts

src/lib/situations.ts

src/routes/calculations/index.svelte

src/routes/decomposition/index.svelte

src/routes/entities/index.svelte

src/routes/parameters/index.svelte

src/routes/spec.svelte

src/routes/variables/index.svelte