xo-gc stack: refactor + streamline.

Retiring unused Collector typealiases.
Fix #include topology.
Fix/improve write barrier setup.

include/xo/procedure2/detail/IGCObject_DPrimitive_gco_0.hpp

@@ -43,7 +43,6 @@ namespace xo {
             ///@{
             using size_type = xo::mm::AGCObject::size_type;
             using AAllocator = xo::mm::AGCObject::AAllocator;
-            using ACollector = xo::mm::AGCObject::ACollector;
             using AGCObjectVisitor = xo::mm::AGCObject::AGCObjectVisitor;
             using VisitReason = xo::mm::AGCObject::VisitReason;
             using Copaque = xo::mm::AGCObject::Copaque;

include/xo/procedure2/detail/IGCObject_DPrimitive_gco_1_gco.hpp

@@ -43,7 +43,6 @@ namespace xo {
             ///@{
             using size_type = xo::mm::AGCObject::size_type;
             using AAllocator = xo::mm::AGCObject::AAllocator;
-            using ACollector = xo::mm::AGCObject::ACollector;
             using AGCObjectVisitor = xo::mm::AGCObject::AGCObjectVisitor;
             using VisitReason = xo::mm::AGCObject::VisitReason;
             using Copaque = xo::mm::AGCObject::Copaque;

include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_dict_string.hpp

@@ -43,7 +43,6 @@ namespace xo {
             ///@{
             using size_type = xo::mm::AGCObject::size_type;
             using AAllocator = xo::mm::AGCObject::AAllocator;
-            using ACollector = xo::mm::AGCObject::ACollector;
             using AGCObjectVisitor = xo::mm::AGCObject::AGCObjectVisitor;
             using VisitReason = xo::mm::AGCObject::VisitReason;
             using Copaque = xo::mm::AGCObject::Copaque;

include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_gco_gco.hpp

@@ -43,7 +43,6 @@ namespace xo {
             ///@{
             using size_type = xo::mm::AGCObject::size_type;
             using AAllocator = xo::mm::AGCObject::AAllocator;
-            using ACollector = xo::mm::AGCObject::ACollector;
             using AGCObjectVisitor = xo::mm::AGCObject::AGCObjectVisitor;
             using VisitReason = xo::mm::AGCObject::VisitReason;
             using Copaque = xo::mm::AGCObject::Copaque;

include/xo/procedure2/detail/IGCObject_DPrimitive_gco_3_dict_string_gco.hpp

@@ -43,7 +43,6 @@ namespace xo {
             ///@{
             using size_type = xo::mm::AGCObject::size_type;
             using AAllocator = xo::mm::AGCObject::AAllocator;
-            using ACollector = xo::mm::AGCObject::ACollector;
             using AGCObjectVisitor = xo::mm::AGCObject::AGCObjectVisitor;
             using VisitReason = xo::mm::AGCObject::VisitReason;
             using Copaque = xo::mm::AGCObject::Copaque;

include/xo/procedure2/detail/IProcedure_Xfer.hpp

@@ -9,10 +9,18 @@
  *       [iface_facet_any.hpp.j2]
  *  3. idl for facet methods
  *       [idl/Procedure.json5]
+ *
+ *  variables:
+ *    {facet_hpp_fname} -> Procedure.hpp
+ *    {impl_hpp_subdir} -> detail
+ *    {facet_ns1} -> xo
+ *    {facet_detail_subdir} -> detail
+ *    {abstract_facet_fname} -> AProcedure.hpp
  **/
 
 #pragma once
 
+#include "AProcedure.hpp"
 #include "RuntimeContext.hpp"
 #include <xo/alloc2/GCObject.hpp>
 

include/xo/procedure2/detail/IRuntimeContext_Xfer.hpp

@@ -9,10 +9,18 @@
  *       [iface_facet_any.hpp.j2]
  *  3. idl for facet methods
  *       [idl/RuntimeContext.json5]
+ *
+ *  variables:
+ *    {facet_hpp_fname} -> RuntimeContext.hpp
+ *    {impl_hpp_subdir} -> detail
+ *    {facet_ns1} -> xo
+ *    {facet_detail_subdir} -> detail
+ *    {abstract_facet_fname} -> ARuntimeContext.hpp
  **/
 
 #pragma once
 
+#include "ARuntimeContext.hpp"
 #include <xo/stringtable2/StringTable.hpp>
 #include <xo/alloc2/Allocator.hpp>
 #include <xo/alloc2/Collector.hpp>