Multiple DSLs chirps

[nicopap]

Users might want different DSLs based on what they are spawning. For example, we could imagine a game level DSL and a UI DSL.

As a result, we might want to support loading chirp files independently from the DSL they use.

A potential way of doing this is to create a registry of DSLs. Adding a ChirpPlugin::<MyDsl> would just add MyDsl to the registry. Then, the chirp file could specify which DSL it uses. If not specified, we could also use a default DSL (that the user declares)