-Two todos remain (and it's becoming obvious that I very much do want lookups to happen as part of the define-handler macro, rather than manually each time)
-stack lookups now happen as part of define-handler
-Removed define-server-handler and define-table-handler (it became clear that auto-adding arguments to the handlers was going to make things confusing for end users)
-Finalized the typed mini-language for defining external handlers
-Separated deletion and insertion fully into delete! and insert! methods
-Moved defgeneric declarations to the package
-Moved deck->stack into model/table.lisp
-Added separate macro for SSE handlers, used it to define event-source
-First finished crack at the server component. Onto a prototype front-end!