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/declarationChecks/propertyInPackageHasNoInheritVisibility.kt

@@ -1,10 +1,10 @@
 package d
 
-<!ILLEGAL_MODIFIER!>override<!> val f : ()-> Int = { 12 }
+<!WRONG_MODIFIER_TARGET!>override<!> val f : ()-> Int = { 12 }
 
 fun test() {
     f()
 }
 
 var g: Int = 1
-    <!PACKAGE_MEMBER_CANNOT_BE_PROTECTED!>protected<!> set(i: Int) {}
+    <!WRONG_MODIFIER_CONTAINING_DECLARATION!>protected<!> set(i: Int) {}