Relax comma rules to allow optional extra end comma

[CeylonMigrationBot]

[@FroMage] I'd like us to relax grammar rules concerning end commas and allow optional trailing commas:

class Foo<A,
                   B,
                   C,
       >(A a,
           B b,
           C c,
         ){
 value seq = {
  a,
  b,
  c,
 };
 Foo<
  Integer,
  String,
  Character,
 >(
  1,
  "a",
  `b`,
 );
} 

This is a particularly terrible example, but allowing extra trailing commas is generally useful, so why not just allow it everywhere commas can be used?

[Migrated from ceylon/ceylon-spec#381]

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