Support AddItem(s) and RemoveItem(s)

[dirtyes]

Helper methods like:

• Append
• Prepend
• Insert
• Remove

[lindowx]

I had the same request, but it looks the project was not maintanced any more.
So, I was plan to make fork it and make some optimizes.

[asticode]

I had the same request, but it looks the project was not maintanced any more.

This project is still actively maintained. I don't have time to answer all issues and I'm also relying on PRs for the biggest changes.