Replace directory-level include_directories() with target-based
include properties to enable modern CMake practices and support
proper transitive include propagation.

Changes:

1. Created ${itk-module}_INCLUDE2_DIRS and ${itk-module}_SYSTEM_INCLUDE2_DIRS
   - Use generator expressions for BUILD_INTERFACE and INSTALL_INTERFACE paths
   - Variables produced in each module's CMake configuration file
   - Enables proper include path handling in build and install trees

2. Modified itk_module_add_library() to apply target properties
   - Uses target_include_directories() instead of directory-level includes
   - Uses target_link_directories() for system library directories
   - Ensures proper PUBLIC include propagation

3. Updated ITKModuleHeaderTest.cmake
   - Added module include directories to header test targets
   - Fixes compilation errors for header-only modules

4. Fixed specific module CMakeLists.txt
   - IO/MINC, IO/TransformMINC: Removed directory-level includes
   - Nonunit/Review: Updated for target-based includes
   - ThirdParty modules: Added necessary include_directories where needed

Compatibility Notes:
- Modules not using itk_module_add_library() may need directory-level
  include_directories() added explicitly
- External modules should update to use itk_module_add_library()

Each ITK CMake interface module includes properties of the module,
include the libraries, include directories, and other ITK interface
modules that are dependecies.

Example usage:

target_link_libraries(
   GradientMagnitudeRecursiveGaussianImageFilter
   PRIVATE
    ITK::ITKImageGradientModule
    ITK::ITKImageIntensityModule
    ITK::ITKImageIO
)

This approach uses target specific requirements and properties to
avoid the need for the directory level properies.

Update all examples to use specific ITK CMake interface module targets
instead of ${ITK_LIBRARIES}. Examples now link to minimal required
modules with PRIVATE visibility and ITKImageIO for I/O.

Enhanced WhatModulesITK.py script with --link option to output
target_link_libraries commands. Fixed regex to parse module names across
multiple lines.

AI was use to generate a script to run WhatModules.py and update
the CMakeLists.txt, then manual assisted corrections were made.

Add ITK_*_FACTORY_REGISTER_MANAGER compile definitions and factory
registration header includes to factory meta-module interface targets.

Use itk_generate_factory_registration in Examples to register
factories.

Introduce ITK_INTERFACE_LIBRARIES variable to allow users to link to
the interface libraries with properties.

Add ITK_LIBRARY_NAMESPACE configuration (defaults to 'ITK') that enables
namespaced targets for all ITK modules (e.g., ITK::ITKCommonModule).

Introduce LIBRARIES_DEPRECATED variable alongside LIBRARIES to maintain
backward compatibility. Create INTERFACE IMPORTED wrappers for old target
names that link to new namespaced targets with DEPRECATION property set.

Update module system to use ${module-targets-namespace} throughout:
- itk_module_impl builds both deprecated and namespaced library lists
- itk_module_link_dependencies uses namespaced targets
- itk_module_test uses namespaced targets
- Factory meta-modules use namespaced targets

Update external itk_modile_config api to use ITK interface module
libraries.

Add init_module_vars() macro to set per-module namespace configuration.

Add documentation for itk_module_target_export() explaining export
mechanism and namespace handling for library targets.