Generate def list of Enumerable with a macro about hamsters

[loicdescotte]

Excellent idea!
With a macro it would be a very powerful feature.

[loicdescotte]

We could use https://github.com/mrvisser/sealerate to get the list of values, or make something similar.

[loicdescotte]

I've added a test exemple for sealerate : https://github.com/scala-hamsters/hamsters/blob/master/shared/src/test/scala/io/github/hamsters/EnumSpec.scala#L56-L65

For the next major it would be good to have a Set instead of a list for the instance list method (as sealerate returns a Set and as it does not make sense to have duplicates in this list).