391 Isolate cmake files of example

[aregtech]

• cleaned up functions.cmake file:
  • removed unused functions and macro
  • moved example relevant functions and macro to the appropriate CMakeLists.txt
  • moved unit test relevant functions to the unit test CMakeLists.txt
• Made changes in the CMakeLists.txt files
• Improved documentation and updated comments in the functions.cmake file.
• Optimized CMakeLists.txt files and structures, reduced number of files.

[vukihub]

Good optimization.