[AndyB] Emoji manager 1.0

Updates editor to allow Firefox to properly use emojis.

This add-on corrects several emoji related issues using the Firefox browser. Inserted emojis now go to the correct location and can be moved and or deleted as with other browsers.

Features:

A 5px padding is added so that multiple emojis have a little space between them.

Questions and answers:

Q: When selecting emojis, why is the Recently used emojis not shown?
A: When using Firefox, the Recently used emojis caused problems, so the function was removed.