Image extraction rosbag2png script

Create a script to extract png images from rosbags.

Features:

• Imagename: YYYY-MM-DDTHH-MM-SS-CAMNAME.png
• Definable start and end time per day (to filter too dark images)
• Blacklist datetime ranges (defect data)
• Definable frequency of extraction
• Run on a folder with all subfolders
• Dryrun mode - get count of images
• Definable outputfolder