Merge branch 'upgrade-svelte' into 'master'

CHANGELOG.md

package-lock.json

package.json

src/app.d.ts

src/app.html

src/hooks.ts

src/lib/api-budget.test.ts

src/lib/components/NavBar.svelte

src/lib/components/NavBarBudget.svelte

src/lib/components/Spinner.svelte

src/lib/components/budget/ConnectionPane.svelte

src/lib/components/budget/api-budget.ts

src/lib/components/parameters/ParameterView.svelte

src/lib/components/parameters/ReferencesView.svelte

src/lib/components/variables/VariableHeader.svelte

src/lib/server/config.ts

src/lib/server/oauth2.ts

src/lib/sessions.ts

src/routes/__error.svelte

src/routes/__layout.svelte