Support for animated plots [FEATURE]

[jlambvo]

Is your feature request related to a problem? Please describe.
The "gganimate" package allows a very simple way to generate animation frames for a ggplot2 with syntax like ggplot() + transition_time(timevariable). But it's not 3D!

Describe the solution you'd like
I would like to render a movie of an animated ggplot by specifying a column to use as the a time step, or for passing a "gganimate" object. A solution like this may relate to #287 allowing generic control of time varying data including water.

A more robust implementation would generate an interactive 3D display with a slider that effectively filters plot data and shadow matrices by the specified dimension, which could then be an option for creating a movie, i.e.: render_movie(..., type = "custom", dim = timevar).

Describe alternatives you've considered
An alternative is to write a function that would iteratively subset my data, create and pass a ggplot instance to plot_gg() and programmatically save the result with render_camera(), but this will incur significant overhead to capture each frame.