Investigate changing "Base" Class into a Trait

[JJJ]

See: https://www.php.net/manual/en/language.oop5.traits.php

This would allow the Base trait be extended more easily, while also eliminating some confusion around including, forking, renaming, etc...

[alexstandiford]

If we take this route, I wonder if it makes sense to break it up into more than one?

[JJJ]

Related: #69, #39.