Regular modifier checker implemented (initial version). A set of tests fixed accordingly.

Most of modifier diagnostic is expressed by REDUNDANT_MODIFIER, INCOMPATIBLE_MODIFIERS, REPEATED_MODIFIER, WRONG_MODIFIER_TARGET, WRONG_MODIFIER_PARENT.
A set of modifier diagnostics is not in use now (but not deleted yet).

compiler/testData/diagnostics/tests/enum/inheritanceFromEnum.kt

@@ -2,7 +2,7 @@
 public enum MyJavaEnum {}
 
 // FILE: test.kt
-<!OPEN_MODIFIER_IN_ENUM!>open<!> enum class MyEnum() {
+<!WRONG_MODIFIER_TARGET!>open<!> enum class MyEnum() {
     A()
 }