[TYPO3-core] RFC #15965: codemirror lib for t3editor should be moved to contrib and updated to latest version

[Steffen Kamper]

Hi,

+1 by reading and testing. I have the feeling that with updated 
codemirror t3 editor renders a lot faster than before, very nice!

One thing has to be adjusted: when edit template setup, t3editor renders 
more than 100% width, the edit area has more width than the container. 
Not related to this RFC, just to mention.

vg Steffen