Collect project header files for CMake

[aregtech]

Description
The CMakeLists.txt files contain only source files, but no header files. In order to manage proper copies during installation, it is required to separate include files so that they can be copies. It is required for each project to create a list of header files, so that can be copied separately. As an example, when building the Framework, there is no need to copy header files of examples or unit tests. So that, they can be separated in a separate list and copied only if there is a special need.