Update centos-art.sh scripts.
    
    - Previously, when passing arguments to centos-art.sh command-line, it
      was possible to use dot (.) as argument to refer the current
      directory but it was not possible to make reference to directories
      from the current location on. This commit makes possible to make
      relative references to directories using the dot-slash (./)
      construction.
    
    - Previously, there was not a defined directory inside modules to
      directory structure to store module's auxiliary files (e.g., sed
      scripts, awk scripts, etc.). This commit sets the Configs/ directory
      for such purposes. To reference the Configs/ directory, when writing
      modules, you need to use the MODULE_DIR_CONFIGS variable and set
      TCAR_SCRIPT_MODULES_BASEDIR=${MODULE_DIR_MODULES} inside
      ${MODULE_NAME}.conf.sh file.
    
    - Previously, there was non a way to reference the copyright's first
      year but writing it literally. This commit adds the
      =COPYRIGHT_YEAR_FIRST= translation marker for it.