Glitch-this

* Fix help text formatting in `commandline.py`

* Add support for float type numbers for glitch_amount

You can now supply floats as glitch_amount! This works best when using floats with maximum of 1-2 decimal places

Read the [docs](https://github.com/TotallyNotChase/glitch-this/wiki) for more info!

* Redesign help text for the commandline script

* Add a more detailed description for the commandline script

* Add more sanity checks in `glitch_this.py`

* Improve Exception handling and Exception messages

* Fix version name

* Add punctuation to help text

* 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

* Reduce compression level from 6 to 3 `glitch_this.py` (improves performance)