Allow pasting of GIFs into composer

[danielabc (Daniela)]

@Falco

the change in the software code to include a new functionality or fix a defect.

In this case, I wrote this functionality and submitted it as a PR, which is evaluated by other colleagues.

I tested it here and YOU ARE TO BE CONGRATULATED! This change greatly improved the usability of the forum, now members can even use gifs uploaded by other members on the forum itself! It looks SENSATIONAL! (Before it didn’t work, it was a frozen image lol) Thank you very much!