Improved directory (non-recursive) reading:

Improved directory (non-recursive) reading:
- Refactured FrameworkDirectoryPointer to use DirectoryIterator (SPL).
- The use of isDot() makes excluding '.' and '..' obsolete (would be double),
  so more classes can be improved here.
- Also use ObjectFactory instead of direct class name for better flexibility.

Signed-off-by: Roland Häder <roland@mxchange.org>