Please add structy-defclass

[cbaggers]

Please add the structy-defclass which can be found here https://github.com/cbaggers/structy-defclass

The rational for this is that I like simple record types and I like structs. The downside is that redefining them give the compiler headaches. The deftclass macro provided lets me use something close enough to the struct syntax that changing them to structs isnt a pain, and it turn I get the clos redefining experience.

I have seen other packages for making defclass nicer to use, but I think the aim of this is 'different enough' that it could still go in. If you folks agree of course :)

Thanks