Migrate core to TS p3 (#896)

packages/loot-core/.babelrc

packages/loot-core/package.json

packages/loot-core/src/client/actions/account.ts

packages/loot-core/src/client/actions/app.ts

packages/loot-core/src/client/actions/backups.ts

packages/loot-core/src/client/actions/budgets.ts

packages/loot-core/src/client/actions/debug.ts

packages/loot-core/src/client/actions/index.ts

packages/loot-core/src/client/actions/modals.ts

packages/loot-core/src/client/actions/notifications.ts

packages/loot-core/src/client/actions/prefs.ts

packages/loot-core/src/client/actions/queries.ts

packages/loot-core/src/client/actions/sync.ts

packages/loot-core/src/client/actions/transactions.js

packages/loot-core/src/client/actions/user.ts

packages/loot-core/src/client/data-hooks/accounts.tsx

packages/loot-core/src/client/data-hooks/payees.tsx

packages/loot-core/src/client/data-hooks/schedules.tsx

packages/loot-core/src/client/reducers/account.ts

packages/loot-core/src/client/reducers/app.ts