Refactor value animators #13

The main idea for the refactor is to make value animator for a compatible gesture independent from its state. Value animation calculations and callbacks will happen only when requested. This means that gestures will be flagged as not in progress during the animation that happens after a gesture which shouldn't be a huge trade-off for more flexibility and better performance if a user doesn't want to use provided animations.

Progress

• remove current ValueAnimators implementation (Enabled flag, interrupt gesture, animators cleanup #16)

• add new optional implementation that does calculations and handles Animators