Merge remote-tracking branch 'origin/topic/timw/266-namespaces'

Merge adjustments:

- Preserved original `base_type_no_ref` argument type as ::TypeTag
- Removed superfluous #pragma guard around deprecated TableVal ctor
- Clarify NEWS regarding MetaHook{Pre,Post} deprecations
- Simplify some `::zeek::` qualifications to just `zeek::`
- Prefixed FORWARD_DECLARE_NAMESPACED macro with ZEEK_

* origin/topic/timw/266-namespaces:
  Disable some deprecation diagnostics for GCC
  Rename BroType to Type
  Update NEWS
  Review cleanup
  Move Type types to zeek namespace
  Move Flare/Pipe from the bro namespace to zeek::detail
  Move Attr to the zeek::detail namespace
  Move Trigger into the zeek::detail namespace
  Move ID to the zeek::detail namespace
  Move Anon.h into zeek::detail namespace
  Mark all of the aliased classes in plugin/Plugin.h deprecated, and fix all of the plugins that were using them
  Move all of the base plugin classes into the zeek::plugin namespace
  Expr: move all classes into zeek::detail
  Stmt: move Stmt classes into zeek::detail namespace
  Add utility macro for creating namespaced aliases for classes

src/DNS_Mgr.h

@@ -11,6 +11,7 @@
 #include "EventHandler.h"
 #include "iosource/IOSource.h"
 #include "IPAddr.h"
+#include "util.h"
 
 template <class T> class IntrusivePtr;
 class Val;
@@ -18,9 +19,10 @@ class ListVal;
 class TableVal;
 class Func;
 class EventHandler;
-class RecordType;
 class DNS_Mgr_Request;
 
+ZEEK_FORWARD_DECLARE_NAMESPACED(RecordType, zeek);
+
 typedef PList<DNS_Mgr_Request> DNS_mgr_request_list;
 
 struct nb_dns_info;
@@ -149,7 +151,7 @@ protected:
 
 	bool did_init;
 
-	IntrusivePtr<RecordType> dm_rec;
+	IntrusivePtr<zeek::RecordType> dm_rec;
 
 	typedef std::list<LookupCallback*> CallbackList;