Merge remote-tracking branch 'origin/topic/awelzel/set-val-on-ids-for-enums'

* origin/topic/awelzel/set-val-on-ids-for-enums:
  broker/main: Adapt enum values to agree with comm.bif
  btest/plugin: Add plugin testing enum identifiers
  Var/add_type: Do not clone EnumType when declared for the first time
  type/id/zeekygen: Add EnumVal to enum identifiers

NEWS

@@ -120,6 +120,10 @@ Changed Functionality
 - The RDP analyzer now also parses connections that do not contain the cookie
   field, which were previously rejected.
 
+- An enum's zeek::detail::ID instance now holds its ``EnumVal``. For example,
+  looking up the "Conn::LOG" identifier allows to directly query the ``EnumVal``
+  using ``ID::GetVal()``.
+
 Removed Functionality
 ---------------------