"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/serialization/builtinsSerializer/annotationArguments/enum.txt

@@ -8,12 +8,12 @@ test.EnumArray(enumArray = {Weapon.PAPER, Weapon.ROCK}) internal final class C2
     public constructor C2()
 }
 
-internal final annotation class EnumArray : kotlin.Annotation {
+kotlin.annotation.annotation() internal final annotation class EnumArray : kotlin.Annotation {
     public constructor EnumArray(/*0*/ enumArray: kotlin.Array<test.Weapon>)
     internal final val enumArray: kotlin.Array<test.Weapon>
 }
 
-internal final annotation class JustEnum : kotlin.Annotation {
+kotlin.annotation.annotation() internal final annotation class JustEnum : kotlin.Annotation {
     public constructor JustEnum(/*0*/ weapon: test.Weapon)
     internal final val weapon: test.Weapon
 }