Multihack doesn't work with "Brackets Snippets" extension

[Omer-Shahar]

Description

Multihack doesn't work with "Brackets Snippets" extension

Steps to Reproduce

1. Enter to a room with someone using Multihack
2. Use a snippet with "Brackets Snippets" extension

Actual behavior: The code apears as it should be, but only for the person who used the snippet. For example:
For the person who used the snippet:
<div></div>
For the other ones:
<diviv> ${3}

In addition, the person who used the snippet can't skip between the variables (of the snippet) while using Multihack too.

Versions

Windows 10, brackets build 1.12.0-17621

[t-mullen]

It doesn't yet track changes made by other extensions. See #17 and #40.