TinyMCE license_key

[petschki]

Adds configurable license key to TinyMCE controlpanel. See plone/plone.base#104

[mister-roboto]

@petschki thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[petschki]

@mauritsvanrees is it save to re-register the tinymce schema to get the new field, or does this override changed values?

[davisagli]

@petschki It should be safe as long as you are just registering it and not setting values