[TASK] Upgrade CodeMirror to v.4.7

Change-Id: I1783332064a4249cbf3e2d0a28c79b034388e3a6
Reviewed-on: http://review.typo3.org/35033
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>
[BUGFIX] Visual styles are broken in TYPO3 7.0

Change-Id: I32abf7fb5dbe98b00c1e7b675e0daa84d221186b
Reviewed-on: http://review.typo3.org/35034
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>