Add new parameters

• Organize argparser help text

• NEW parameters for glitch_image and glitch_gif in glitch_this.py:-

  • glitch_change: Increment/Decrement glitch_amount by given amount after every glitching

  • cycle: Whether or not to cycle glitch_amount back to 1 or 10, if it overflows or underflows

  • step: Glitch every step'th frame, instead of all of them

• NEW parameters for commandline.py:-

  • -i, --increment: Increment/Decrement glitch_amount by given amount after every glitching

  • -cy, --cycle: Whether or not to cycle glitch_amount back to 1 or 10, if it overflows or underflows

  • step: Glitch every step'th frame, instead of all of them

  • relative_duration: Use a duration relative to the source GIFs duration