BUG: Fix Python wrapping for itk::bio namespace classes

Three issues prevented the Python wrapping from building:

1. WRAPPER_AUTO_INCLUDE_HEADERS was ON, causing itk_wrap_class to
   auto-derive wrong header filenames (itkCellularAggregateBase.h
   instead of itkBioCellularAggregateBase.h). Disable auto-include
   and rely on the explicit itk_wrap_include() directives, matching
   the pattern used by Ultrasound (BlockMatching) and ITK Statistics.

2. CellularAggregateBase is a non-template class but was wrapped with
   itk_wrap_class/itk_end_wrap_class (no itk_wrap_template calls),
   producing an empty SWIG interface. Use itk_wrap_simple_class
   instead so the class is properly registered.

3. itk_auto_load_submodules() processes .wrap files alphabetically,
   causing CellularAggregate to load before its base class. Add
   WRAPPER_SUBMODULE_ORDER to enforce correct dependency ordering.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hjmjohnson

wrapping/CMakeLists.txt

@@ -1,3 +1,7 @@
 itk_wrap_module(BioCell)
+set(WRAPPER_SUBMODULE_ORDER
+  itkBioCellularAggregateBase
+  itkBioCellularAggregate
+)
 itk_auto_load_submodules()
 itk_end_wrap_module()

wrapping/itkBioCellularAggregate.wrap

@@ -1,5 +1,7 @@
+set(WRAPPER_AUTO_INCLUDE_HEADERS OFF)
 itk_wrap_include("itkBioCellularAggregate.h")
 itk_wrap_class("itk::bio::CellularAggregate" POINTER)
   itk_wrap_template("2" "2")
   itk_wrap_template("3" "3")
 itk_end_wrap_class()
+set(WRAPPER_AUTO_INCLUDE_HEADERS ON)

wrapping/itkBioCellularAggregateBase.wrap

@@ -1,3 +1,4 @@
+set(WRAPPER_AUTO_INCLUDE_HEADERS OFF)
 itk_wrap_include("itkBioCellularAggregateBase.h")
-itk_wrap_class("itk::bio::CellularAggregateBase" POINTER)
-itk_end_wrap_class()
+itk_wrap_simple_class("itk::bio::CellularAggregateBase" POINTER)
+set(WRAPPER_AUTO_INCLUDE_HEADERS ON)