0026865: Configuration, CMake - ensure consistency between FILES and actual content...

0026865: Configuration, CMake - ensure consistency between FILES and actual content of inc and src folders

headers from inc folder are being checked for using in further building process
parse FILES file to collect header files for inc folder

during cleaning inc folder, do not remove the headers with name not containing their package name

FILES is parsed not only for headers files

Warning is emitted when a file in folder is not involved to corresponding FILES file
lex and yacc file added StepFile/FILES file

Small correction