add inQuad Easing method
add all Quad easing curves
add all Cubic easing curves
add all Quart easing curves
add all Quint easing curves
add all sine easing curves
add all expo easing curves
add all Circ easing curves
add all Elastic easing curves
add all Back easing curves
add all Bounce easing curves
add bounce easing curves to mainContext
refactor Quad easing curves
refactor Cubic easing curves
refactor Quart easing curves
refactor Quint easing curves
refactor Sine easing curves
refactor Expo easing curves
fix class name
refactor Circ easing curves