Deprecate escaped modifiers and unescaped annotations

compiler/testData/diagnostics/tests/annotations/kt1860-positive.kt

@@ -1,12 +1,12 @@
 @Target(AnnotationTarget.VALUE_PARAMETER, AnnotationTarget.EXPRESSION)
 annotation class test
 
-fun foo(test <!UNUSED_PARAMETER!>f<!> : Int) {}
+fun foo(@test <!UNUSED_PARAMETER!>f<!> : Int) {}
 
 var bar : Int = 1
     set(test v) {}
 
 val x : (Int) -> Int = {@test <!TYPE_MISMATCH!>x<!> <!DEPRECATED_STATIC_ASSERT!>: Int<!> <!SYNTAX!>-> x<!>} // todo fix parser annotation on lambda parameter
 
-class Hello(test <!UNUSED_PARAMETER!>args<!>: Any) {
+class Hello(@test <!UNUSED_PARAMETER!>args<!>: Any) {
 }