Script to auto-generate video

[yoandyshyno]

See Issue #8
The following task were done.

• Python3 compatibility.
• Use more Clases from photofilmstrip's modules. (E.g. ProjectFile, ActionAutoPath) for compatibility.
• Improve further the code for maintainability and simplicity.
• Duration and time per image optional arguments.

Command format:

usage: photofilmstrip-auto [-h] [-d DESTINATION_PATH] [-u DURATION]
                           [-x TIME_PER_IMAGE]
                           directory_path

Generate video from images in a directory.

positional arguments:
  directory_path        Path of directory with source images.

optional arguments:
  -h, --help            show this help message and exit
  -d DESTINATION_PATH, --destination-path DESTINATION_PATH
                        Path where output files will be created.
  -u DURATION, --duration DURATION
                        Set the duration of the output Video.
  -x TIME_PER_IMAGE, --time-per-image TIME_PER_IMAGE
                        This is use to calculate the total time based on the
                        number of images.