Fix CMake style to match extension template
Set MODULE_NAME within CLI module CMakeLists.txt
Use "add_subdirectory" instead of deprecated "subdirs" command
Use "SEMMacroBuildCLI" instead of deprecated "slicerMacroBuildCLI"
Fix missing "itkTestMain.h" error by moving CLI Testing in CLI directory

Since the macro "SEMMacroBuildCLI" takes care of including all expected '
directories, the associated Tests should be added within a sub-directory.
Set CLP variable specific to the CLI module using MODULE_NAME value
Merge pull request #4 from jcfr/fix-itkTestMain-missing-header

Fix itk test main missing header. Update extension configuration files (CMake)