Type coercion with Type.make(otherType)

[OAGr]

JS has decent type coercion.

I think in the case of Squiggle, we could do a lot of this with the make syntax.

String.make(t) -> Converts any type to string.
SampleSet.make(t) -> If t is a dist, makes it from that. If t is a list of numbers, makes the list of numbers.
PointSet.make(t) -> If t is a dist, make from that.
Dict.make(plot) -> Converts plot arguments into a dict. Also, works for other objects that are basically just records/dicts.

[OAGr]

We have this now!