[server] Allow editing a given drawing

[zaidalyafeai]

[zaidalyafeai]

[Shubbair]

Do you need this design to be on the website?

[zaidalyafeai]

Yes on the main page. If you have any questions let me know. The basic idea is to allow the user to edit a stroke that was written in the past. The main js script is paper.js.

[Shubbair]

Okay, I will try to do it in an efficient way.

[Shubbair]

Zaid, I just wonder why you need to make a drag option to the letter ?
I think clear and update is enough because it's already in the correct sequence.