Make classes disposable

[junalmeida]

Do you think it makes sense to inherit IDisposable to classes like PdfWriter, PdfReader, and others whenever makes sense?
If you agree, willing to accept Pull requests?

[bmeredith]

Hey @junalmeida, thanks for reaching out, I am certainly open and welcome to accepting to PRs!

What you say makes sense.

In regards to PdfWriter, from what I understand in later versions of ITextSharp, IDisposable was added to IDocListener which is where I would like to see it implemented as well if done.

[VahidN]

You can try the updated version https://github.com/VahidN/iTextSharp.LGPLv2.Core