Modernize forms library

Umbrella issue for work on forms library:
- [ ] Move library to Typescript
- [ ] Remove flexbox-react code
- [x] Update to react-bootstrap (fix icons)
- [ ] Add storybook for development, testing and docs
- [ ] Update to latest version of react-select, combine with react-window
- [ ] Overhaul build setup (rollup)

Components that need to work:
- [x] TextEdit
- [ ] TextArea
- [ ] DateEdit
- [ ] Chooser (based on react-select)
- [ ] AsyncChooser (based on react-select)
- [ ] TagsEdit (based on react-select)

Additional components
- [ ] List and list HOC
- [ ] Views

Covered examples:
- [ ] Basic form with tri-state edit modes (always, selected and never)
- [ ] Dynamic changing form
- [ ] List contact example

Storybook:
- [x] Initial setup so we can add stories in Typescript
- [ ] Snapshot testing
- [ ] Docs