add option to reassign directories for media

now it's done through a variables photo_dir and media_dir, these should
be filled in before running and they are intended to fit your specific
setup. e.g. mine uses /assets folder for such file storage.

add raw parser

handles:
  - photo
  - text with bold, italic, underlined, stroke style and with links.
  - audio files

not handles:
  - tags
  - replies
  - forwarded messages