Port the settings components to TS (#1405)

packages/desktop-client/src/components/Page.tsx

packages/desktop-client/src/components/common/Select.tsx

...ges/desktop-client/src/components/settings/Encryption.tsx

...s/desktop-client/src/components/settings/Experimental.tsx

packages/desktop-client/src/components/settings/Export.tsx

...ages/desktop-client/src/components/settings/FixSplits.tsx

packages/desktop-client/src/components/settings/Format.tsx

packages/desktop-client/src/components/settings/Global.tsx

packages/desktop-client/src/components/settings/Reset.tsx

packages/desktop-client/src/components/settings/Themes.tsx

packages/desktop-client/src/components/settings/UI.tsx

packages/desktop-client/src/components/settings/index.tsx

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

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

packages/loot-core/src/client/state-types/modals.d.ts

packages/loot-core/src/server/main.ts

packages/loot-core/src/server/sync/index.ts

packages/loot-core/src/types/prefs.d.ts

packages/loot-core/src/types/server-handlers.d.ts

packages/loot-core/src/types/util.d.ts