Fix multiline parsing issues fixes #174

[jasonwilliams]

For the TLDR see before and after below...

The issue was with the main regex, specially the beginning match, which only matches an expression which ends with a back tick. When you use multiline properties your top line no longer ends the same way (styled.div<{). This means we need to set a new beginning match. I tried doing this as a new rule but it just didn't work, instead I split the regex into 2 (non-captured) groups and the second group matches:

}>`

and sets that as the beginning match, so anything after the above will be treated as SCSS, up until the next backtick

• before
• after
• Set colorize-fixtures as the folder for extensionHost (debugging)
• create a multiline fixture from issue Syntax highlighting breaks if there is a linebreak between "styled" and opening backtick ` #174
• Fixed by creating two groups, one which was the same as before, and one which adds support for }>` syntax as the beginning. Tests have passed