Generalize approach to time management/temporal data

[mwestphal]

Animation is currently managed by the animationManager and rely on events and a timer logic by VTK in the libf3d.

In F3D application, there is a very simple event loop that is needed because of the watch option.

Refactor and generalize an approach to time to be put in the libf3d that will support everything we need including:

• temporal data with animation (obv)
• Application side mechanics (like the --watch stuff)
• Shader based temporal implementation
• Interaction with inertia (like camera throw)