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.

compiler/testData/psi/examples/AnonymousObjects.kt

@@ -11,7 +11,7 @@ addMouseListener(object : MouseAdapter() {
 })
 
 enum class GodMessages {
-  TOO_MANY_CLICKS
+  TOO_MANY_CLICKS,
   ONE_MORE_MESSAGE
 }