Enum deprecated syntax detection implemented and integrated into DeclarationsChecker.

A lot of tests was changed to refactor deprecated syntax. Six new tests were added to check deprecated syntax detection.
Diagnostic for "enum entry uses deprecated super constructor": constructor is highlighted
Diagnostic for "enum entry uses deprecated or no delimiter".
One warning removed.

compiler/testData/diagnostics/tests/redeclarations/kt2418.kt

@@ -3,24 +3,24 @@
 package kt2418
 
 enum class A {
-    <!REDECLARATION!>FOO<!>
+    <!REDECLARATION!>FOO<!>,
     <!REDECLARATION!>FOO<!>
 }
 
 enum class B {
-    FOO
+    FOO;
     
     fun FOO() {}
 }
 
 enum class C {
-    <!REDECLARATION!>FOO<!>
+    <!REDECLARATION!>FOO<!>;
     
     val <!REDECLARATION!>FOO<!> = 1
 }
 
 enum class D {
-    <!REDECLARATION!>FOO<!>
+    <!REDECLARATION!>FOO<!>;
     
     class <!REDECLARATION!>FOO<!> {}
 }