color bar legend controls

[cyrush]

position:

here are the matplot lib positions: (https://matplotlib.org/stable/api/legend_api.html)

'best'	0
'upper right'	1
'upper left'	2
'lower left'	3
'lower right'	4
'right'	5
'center left'	6
'center right'	7
'lower center'	8
'upper center'	9
'center'	10

orientation?

vertical or horizontal

qs:

should we allow user to set this for a specific legend by index, or should we support setting loc for first legend, and then some heuristic (cw or ccw)