3.0/feature/refactor react module

[nRamstedt]

This PR focuses on applying styles from new styleguide & improving UI/UX

Changelog

• Add refactored hbg-react library
• Add loader when fetching data
• Refactor DatePicker
• Refactor pagination
• Refactor dropdown components
• Refactor button components
• Refactor input components (search)
• Refactor EventList & EventItem
• Refactor preloader

Limitation/Bugs

• Datepicker does not close when clicking outside datepicker
• Messy react implementation (no linter, stateful class components because of old react version, old code)

How to test:

1. Install dependecies & build (npm run build)
2. Install & activate plugin in wordpress
3. Go to Events -> Options and set days to 250 and the following api url: https://api.helsingborg.se/event/json/wp/v2
4. Enable Event Module (in modularity options)(
5. Create new event module with following settings: All filters enabled & index view

Required dependecies:

• Styleguide version 0.11.109 or higher, which contains a fix for the o-grid-fit class

[sebastianthulin]

• Cards does not have an equal height. height: 100%; needs to be added to card component.
• Dropdown selections should not use primary color, make default grey color.
• Preloader is a bit big.
• Indication is needed on filters, it may be hard to conceive that they actually are dropdown alternatives.