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/util/Comparison.txt

@@ -219,17 +219,17 @@ JetFile: Comparison.kt
       ENUM_ENTRY
         OBJECT_DECLARATION_NAME
           PsiElement(IDENTIFIER)('LS')
-      PsiElement(COMMA)(',')
+        PsiElement(COMMA)(',')
       PsiWhiteSpace(' ')
       ENUM_ENTRY
         OBJECT_DECLARATION_NAME
           PsiElement(IDENTIFIER)('EQ')
-      PsiElement(COMMA)(',')
+        PsiElement(COMMA)(',')
       PsiWhiteSpace(' ')
       ENUM_ENTRY
         OBJECT_DECLARATION_NAME
           PsiElement(IDENTIFIER)('GR')
-      PsiElement(SEMICOLON)(';')
+        PsiElement(SEMICOLON)(';')
       PsiWhiteSpace('\n')
       PsiElement(RBRACE)('}')
   PsiWhiteSpace('\n\n')