Add GPU memory release method

[gourdchen]

surfplot is such a excellect toolbox for visualization surface in Python. However, I found that if I called it looping to draw, it could cause a GPU memory overflow (I only have 4G GPU mem) and IPython to crash. I found that I could manually clear the existing plotter to avoid this problem, while the surfplot only return plotter.show() not plotter. So, I use

from brainspace.plotting.base import Plotter
Plotter.close_all()

to avoid GPU memory overflow. I believe it can be better if there are some method that can automatically close plotter afer we build the matplotlib object. I hope this can be helpful.

[danjgale]

Excellent idea and great catch! I completely agree. This will be easy to implement, and I'll let you know when I've added this in shortly. Thanks for the issue and using surfplot!