Include all EIPScanner files based on library-path

[jan-ati]

1. Changes all #include directives to reference files relative to the EIPScanner root project src directory.

   • This removes the need to add both /usr/local/include and /usr/local/include/EIPScanner to the LIBRARY_PATH variable and simplifies child-directories referencing files in parent directories

2. Modifies the CMakeLists.txt structure to use the target_sources() method

   • https://crascit.com/2016/01/31/enhanced-source-file-handling-with-target_sources/
   • This isolates the files that the parent CMakeLists.txt needs to track and effectively groups each directory

3. Modifies the examples to use the full library path (as will be done by projects using this library)