rDCS4f754948e9dd

Add methods to manipulate message attachments (#83)

* Add methods

* Rename to KeepOrModifyAttachments

* Make public

* Exp-Keep

* Fix?

* work?

* Test

* Try fix

* Here we go again

* BULLSHIT

* yep bullshit

* Remove debug statements

* Add KeepAttachments & ModifyAttachments to WebhookBuilder

* Allow to keep attachments on interaction modify & followup modify

* keep attachments defaults now to null

You have to explicit say if you want to remove attachments.
If you…