Enum parsing changed: first entries, then members. Grammar fixed accordingly.

A set of compiler tests and some plugin tests changed accordingly.
Compiler Kotlin code changed accordingly.

js/js.translator/testData/enum/cases/enumWithInheritance.kt

@@ -1,8 +1,6 @@
 package foo
 
 enum class B(open val bar: Int) {
-    val x = 1
-    var y = 12;
     a : B(0) {
         override val bar = 3
         init {
@@ -12,6 +10,8 @@ enum class B(open val bar: Int) {
     b : B(4) {
     }
     c : B(5)
+    val x = 1
+    var y = 12;
 }
 
 trait X {