"annotation" is now parsed as an identifier. It is no longer a soft keyword.

Sometimes it's allowed to parse "annotation" unescaped even if other annotations must be escaped.
A set of annotations and their options tests.
A swarm of existing tests fixed (mostly kotlin.annotation.annotation() added to txt-files).
STUB_VERSION increased. Some quick fixes slightly changed.

compiler/testData/diagnostics/tests/modifiers/IllegalModifiers.kt

@@ -97,7 +97,7 @@ abstract class IllegalModifiers6() {
 class IllegalModifiers7() {
     <!ILLEGAL_ENUM_ANNOTATION!>enum<!>
     <!ILLEGAL_MODIFIER!>inner<!>
-    <!ILLEGAL_ANNOTATION_KEYWORD!>annotation<!>
+    annotation
     <!ILLEGAL_MODIFIER!>out<!>
     <!ILLEGAL_MODIFIER!>in<!>
     <!ILLEGAL_MODIFIER!>vararg<!>
@@ -105,7 +105,7 @@ class IllegalModifiers7() {
     val x = 1
     <!ILLEGAL_ENUM_ANNOTATION!>enum<!>
     <!ILLEGAL_MODIFIER!>inner<!>
-    <!ILLEGAL_ANNOTATION_KEYWORD!>annotation<!>
+    annotation
     <!ILLEGAL_MODIFIER!>out<!>
     <!ILLEGAL_MODIFIER!>in<!>
     <!ILLEGAL_MODIFIER!>vararg<!>
@@ -119,7 +119,7 @@ class IllegalModifiers8 {
     <!ILLEGAL_ENUM_ANNOTATION!>enum<!>
     <!ILLEGAL_MODIFIER, REDUNDANT_MODIFIER, REDUNDANT_MODIFIER, INCOMPATIBLE_MODIFIERS!>open<!>
     <!ILLEGAL_MODIFIER!>inner<!>
-    <!ILLEGAL_ANNOTATION_KEYWORD!>annotation<!>
+    annotation
     <!ILLEGAL_MODIFIER!>override<!>
     <!ILLEGAL_MODIFIER!>out<!>
     <!ILLEGAL_MODIFIER!>in<!>
@@ -143,7 +143,7 @@ class IllegalModifiers10
 <!ILLEGAL_ENUM_ANNOTATION!>enum<!>
 <!ILLEGAL_MODIFIER, REDUNDANT_MODIFIER, REDUNDANT_MODIFIER, INCOMPATIBLE_MODIFIERS!>open<!>
 <!ILLEGAL_MODIFIER!>inner<!>
-<!ILLEGAL_ANNOTATION_KEYWORD!>annotation<!>
+annotation
 <!ILLEGAL_MODIFIER!>override<!>
 <!ILLEGAL_MODIFIER!>out<!>
 <!ILLEGAL_MODIFIER!>in<!>

compiler/testData/diagnostics/tests/modifiers/IllegalModifiers.txt

@@ -45,7 +45,7 @@ package illegal_modifiers {
     }
 
     internal final class IllegalModifiers10 {
-        public constructor IllegalModifiers10()
+        kotlin.annotation.annotation() public constructor IllegalModifiers10()
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
@@ -100,15 +100,15 @@ package illegal_modifiers {
 
     internal open class IllegalModifiers7 {
         public constructor IllegalModifiers7()
-        internal final val x: kotlin.Int = 1
+        kotlin.annotation.annotation() internal final val x: kotlin.Int = 1
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-        internal final fun foo(): kotlin.Unit
+        kotlin.annotation.annotation() internal final fun foo(): kotlin.Unit
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
 
     internal final class IllegalModifiers8 {
-        public constructor IllegalModifiers8()
+        kotlin.annotation.annotation() public constructor IllegalModifiers8()
         public constructor IllegalModifiers8(/*0*/ x: kotlin.Int)
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
@@ -138,7 +138,7 @@ package illegal_modifiers {
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
 
-    internal final annotation class annotated : kotlin.Annotation {
+    kotlin.annotation.annotation() internal final annotation class annotated : kotlin.Annotation {
         public constructor annotated(/*0*/ text: kotlin.String = ...)
         internal final val text: kotlin.String
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean

compiler/testData/diagnostics/tests/modifiers/primaryConstructorMissingKeyword.txt

@@ -17,7 +17,7 @@ internal final class A {
     }
 }
 
-internal final annotation class Ann : kotlin.Annotation {
+kotlin.annotation.annotation() internal final annotation class Ann : kotlin.Annotation {
     public constructor Ann(/*0*/ x: kotlin.Int = ...)
     internal final val x: kotlin.Int
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean