Chris Hill-Scott b73e42650d Refactor hex colour preview Javascript ...

This commit improves the code that previews a hex colour when setting up
or changing an email branding.

Specifically it:
- refactors the Javascript to conform to our patterns (module pattern,
  preprocessed with Gulp)
- makes the code work when there are multiple colour previews on one
  page

It also does some visual prettifying, because I couldn’t help myself…

2018-08-22 16:31:05 +01:00

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