Basic Object Serialisation #271
This PR is the first step towards introducing actor snapshots to SOMns,
Each SClass now has a serialization node, which can be used to (de)serialize instances of the represented class.
Possibly introduces a performance regression for the startup time of the List benchmark on Graal (#273)
smarr left a comment
I think generally fine, there are some cosmetics in here, I'd like you to look at.
Otherwise, I am happy to merge it without anything extra. Though, I doubt this code will survive the first benchmark unchanged.