Pyvideothumbnailer

Improve preview thumbnail image creation by recognizing if a video is rotated according to metadata and counterrotating preview images accordingly. This will work for rotations of 90°, 180° and 270°. Rotation will also be taken into account when establishing if a video is a vertical video and to decide on switching the number of preview thumbnail rows and columns.

Improve checking of rwx permissions of directories. Fix a bug where preview thumbnails images were not written to the explicitly specified output directory if the directory containing the video files was not writable.

Fix a bug, where option `background_color` from the config file was not parsed.

Add .mts video extension (MPEG transport stream, older Sony cameras) and fix a typo in option `--vertical-video-columns`.

The code has been refactored in a completely object-oriented way. It is now possible to easily integrate Python Video Thumbnailer into external Python code. Further, the source has been restructured in order to build a Python package on PyPI.

Add a new argument `--no-header` and a corresponding config file option `no_header`. It allows to disable addition of a header with information on file, video and audio metadata and a comment to created preview thumbnails images.