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.

idea/testData/formatter/EmptyLineAfterObjectDeclaration.after.kt

@@ -30,6 +30,7 @@ interface T1
 
 enum class E1 {
     ENTRY;
+
     object O7
 }
 
@@ -67,6 +68,7 @@ interface T2
 
 enum class E2 {
     ENTRY;
+
     object O14 {}
 }
 
@@ -109,6 +111,7 @@ interface T3
 
 enum class E3 {
     ENTRY;
+
     object O21 {
     }
 }