Menus.cpp no longer link dependent on top level menu definitions...

... They all use the registry.

(This link dependency was not shown in diagrams generated by scripts/graph.pl,
because it was not reflected in Menus.h but was done using extern declarations
within Menus.cpp.  That was a cheat, but it let all the other dependencies
be exposed in the graph and mitigated first.)

src/menus/ViewMenus.cpp

@@ -385,9 +385,10 @@ static CommandHandlerObject &findCommandHandler(AudacityProject &project) {
 MenuTable::BaseItemSharedPtr ToolbarsMenu();
 
 // Under /MenuBar
-MenuTable::BaseItemSharedPtr ViewMenu()
+namespace {
+using namespace MenuTable;
+BaseItemSharedPtr ViewMenu()
 {
-   using namespace MenuTable;
    using Options = CommandManager::Options;
 
    static const auto checkOff = Options{}.CheckState( false );
@@ -463,4 +464,10 @@ MenuTable::BaseItemSharedPtr ViewMenu()
    
 }
 
+AttachedItem sAttachment1{
+   wxT(""),
+   Shared( ViewMenu() )
+};
+}
+
 #undef FN