Add more positioning arguments

[rcannood]

Solution for #7.

Allows overriding arguments related to positioning of elements in the funky_heatmap.

[rcannood]

Hey @artuurC and @LouiseDck. I want to add this helper function to group together arguments related to positioning of elements in the funky heatmap. Do you think these changes are a good idea? If so, can we apply the same changes to funkyheatmappy?

[rcannood]

Alternatively, we might decide to include many more args into this argument list helper function. WDYT

[LouiseDck]

I think these arguments are fine.
At first glance I think these are the ones people might want to change most often. If this is not the case, it's relatively painless to add them.
The defaults stay the same, which is good.
I foresee no issues implementing this in the python version.