Enhance show_object to accept string argument

[lorenzncode]

I typically specify the show_object name parameter with the same name as the variable.

show_object(mypart4, name="mypart4")`

In this case a descriptive or identifiable variable name has been defined and I'd like to avoid repeating it in the name parameter. The proposed enhancement is to support a string as the first argument to show_object.

show_object("mypart4")

The benefit is a less verbose and repetitive syntax. Editing a script to modify the displayed objects would be (slightly) quicker.

Of course the existing syntax would continue to work. Would this change be acceptable?

Example script to show select objects.:

import cadquery as cq

mypart1 = cq.Workplane().box(1, 1, 1)
mypart2 = cq.Workplane(origin=((2, 0, 0))).box(1, 1, 2)
mypart3 = cq.Workplane(origin=((4, 0, 0))).box(1, 1, 3)
mypart4 = cq.Workplane(origin=((6, 0, 0))).box(1, 1, 4)
mypart5 = cq.Workplane(origin=((8, 0, 0))).box(1, 1, 5)
mypart6 = cq.Workplane(origin=((10, 0, 0))).box(1, 1, 6)

show_object("mypart4")
show_object("mypart5")
show_object("mypart6", options={"color": "yellow"})