v0.3.0

• Add Button (styled button) and buttonStyle
• Add Card
• Add Modal
• Add ConfirmationModal
• Add ErrorBox and boxError
• Add happy color
• Add -bw-inverted versions of danger, accent and happy color.
• Add strokeColor prop to Spinner to modify the stroke color
• Add currentRef helper
• Change danger4 and danger5 in dark mode to be lighter
• Update devDependency @opencast/eslint-config-ts-react from 0.1 to 0.2