Volume Spread for VSA Custom

Hey everyone, I have been using volume a lot more lately as price action can sometimes get manipulated but volume shows us the truth!
Anyways, I have enjoyed the Volume Spread for VSA indicator but wished I had the code to change a few settings. This volume indicator includes spread analysis with the ability to customize input values and I'm making it open source so you can do with it as you please.
I have made notes all throughout the code to give suggestions on a few changes or why I have written it in such a way. I have also tried to section everything off to make it easier to see where each piece of the code is used. Overall I think it is a good example of how to code cleanly and how to add useful notes when you are learning Pine for yourself :D

The indicator on the price chart is my Donchian Channel indicator, which you can also find on my profile. This is the one I use every day.

ملاحظات الأخبار:

- Changed format to volume, this changes the indicator values from i.e. 3518.00 to 3.518k
- Included a drop down list to change the moving average type
- Included an option to draw the bars as a histogram or as columns
- Updated a few plot lines to use the new options from the menus created above
- Changed a few color values to the way I like them. Feel free to use the whatever values you like.