Drop old enum syntax. Comma / semicolon are now a syntactic part of enum entry.

Comma must present now between enum entries, semicolon between last entry & first member, constructor calls must be without colons / specifiers.
A swarm of tests fixed accordingly.

j2k/testData/fileOrElement/enum/enumWithNameField.kt

@@ -1,4 +1,5 @@
 enum class E {
     I;
+
     private val name: String? = null
 }