Fix issues in snippets.json

[matthewpizza]

Hi! Thanks for creating this extension. This PR is to resolve a couple issues with snippets:

• Removes extra escaping that inserted \ with the snippet (fixes #6)
• Fixes the right delimiter in the literal, block, and extends snippets
• Removes preceding and proceeding new lines \n
• Removes the "scope" property which the linter didn’t like
• Uses \t for all indenting

[jens1o]

Just tested it, it's working perfect! :)

[jens1o]

Thank you!

[matthewpizza]

Thanks for merging!

[jens1o]

The version has been published! :)