Add a CMake function allowing to update icon

[jcfr]

Within a CMake folder, you could for example named the file CTKResEdit.cmake

This file would contain a function named ctk_resedit_update_icon allowing to update an icon. For now we will consider that this function will update the executable at configure time.

Make sure to test the macro. Example showing how to test CMake macro are available here: https://github.com/commontk/AppLauncher/blob/master/CMake/MIDASAPICore.cmake#L461

The test could then be added doing something similar to: https://github.com/commontk/AppLauncher/blob/master/Testing/Cpp/CMakeLists.txt#L25

The macro should also be packaged.