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/file_analysis/analyzer/x509/X509.cc

@@ -395,7 +395,7 @@ void file_analysis::X509::ParseSAN(X509_EXTENSION* ext)
 		else if ( gen->type == GEN_IPADD )
 			{
 				if ( ips == nullptr )
-					ips = make_intrusive<VectorVal>(zeek::id::find_type<VectorType>("addr_vec"));
+					ips = make_intrusive<VectorVal>(zeek::id::find_type<zeek::VectorType>("addr_vec"));
 
 				uint32_t* addr = (uint32_t*) gen->d.ip->data;