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/Enums.kt

@@ -1,5 +1,7 @@
 enum class Color(val rgb : Int) {
-    RED : Color(0xFF000)
-    GREEN : Color(0x00FF00)
-    BLUE : Color(0x0000FF)
+    RED(0xFF000),
+    GREEN(0x00FF00),
+    BLUE(0x0000FF)
+
+    // the end
 }