Prop adjustment, export type declaration for directions and ColorWheelProp

Prop adjustment, export type declaration for directions and ColorWheelProp

New functionality

Added directions to gradients
Added different gradient types
Users can choose number of pickers (1 for static background colour, 2+ for gradient)
Fixes in warning messages with react-draggable
Performance optimisations

1.0.0

First release of gradiently