Expand Image Float Clearing to Lists

This expands on header and dividers clearing image floats

I would argue this should be expanded to lists so you have more control where the image sits for each point. This would allow someone to do a numerical step list and properly align the step image with each point.

1. Step is this [image}
2. Step is here
3. [image] Step is there

This maintains where the writer would expect the image and if there need to be a float they can still do it outside the list and move it up or down.