Add a system for video layout customisation

[garymooney]

It would be good to have a system that allows easy customisation of video output. A grid could be used to specify in what tiles do certain bits of information take up in the video frame, similar to matplotlib's subplot_mosaic method. For example, subplot_mosaic is already used for subplotting layouts in the video generation of this project with code that looks like:

grid_spec = {
    "bottom": 0.08,
    "top": 0.95,
    "left": 0.07,
    "right": 0.99,
    "wspace": 0.05,
    "hspace": 0.09,
}
ax_dict = fig.subplot_mosaic(
    [
        ["pure_state_2", "main", "main", "pure_state_3"],
        ["pure_state_4", "pure_state_5", "pure_state_6", "pure_state_7"],
    ],
    gridspec_kw = grid_spec,
)
plots_order = ["main", "pure_state_2", "pure_state_3", "pure_state_4", "pure_state_5", "pure_state_6", "pure_state_7"]

Custom colour layouts would also be useful.

A class that handles layout and customisation could work well. Templates of premade layouts could be chosen by the user by calling a method that instanciates the class object and fills it out with layout information, or by instantiating a specific derived class.