This PR is related to#89 and adds@property setters and getters to every singleArtist subclass. The core logic for this turns out to be surprisingly simple:

https://github.com/lukelbd/proplot/blob/5d29f3148975e898452c4101dab6338e2908c50f/proplot/artist.py#L14-L50

After this PR is merged proplot users will be able to use the much cleaner, more object-oriented "dot" syntax for changing matplotlib artist attributes:

# Original APIfig,ax=pyplot.subplots()ax.set_title('Title')ax.set_xlabel('xlabel')ax.set_xticks([1,2,3])h,=ax.plot(...)h.set_color('red')h.set_linewidth(1)# ProPlot API if this is mergedfig,ax=proplot.subplots()ax.format(title='Title',xlabel='xlabel',xticks=[1,2,3])# with bulk setterax.title='Title'# with individual settersax.xlabel='xlabel'ax.xticks= [1,2,3]h,=ax.plot(...)h.color='red'h.linewidth=1

I am not sure about the side-effects of this -- the problem is this breaks classes that use instance-level attributes with the same names as the setters and getters (e.g. if an artist subclass both the getterget_linewidth() and the literal attributelinewidth), and the only way to address this is to go through the source code class-by-class and make explicit exceptions (which is quite fragile, since the attributes may change from version-to-version). Monkey patching is not possible because youcannot add properties as instance-level attributes.

This is a really neat PR, but it will require a lot of testing and it's not as high priority as some other PRs. So it may be quite a while before this is merged.