Replace condition with the more powerful switch

[roblabla]

Protocols define a data-type named "switch" which seem to handle everything condition does, in a cleaner, more readable way. It looks like this :

{
  "type": "switch",
  "typeArgs": {
      "compareTo": "this.someOtherArg",
      "fields": {
        "0": "int",
        "default": "void"
      }
  }
}

Void is a new datatype that does nothing. It doesn't read, and returns nothing. It may as well not have been called.

[roblabla]

done with #43