Release v1.7.0

• Merged the initialHours, initialMinutes and initialSeconds props into a single initialValue prop with type { hours?: number, minutes?: number, seconds?: number }. This is for clarity and easy-of-use, whilst also guarding against a crash when a similar object was supplied to the old props.
• Added missing typings for custom styles - contrubuted by @giovanniRodighiero 🙌