no issue
- we had some code in `<KoenigEditor>` that was automatically saving a card when exiting edit mode based on some flawed logic, this meant we were making multiple editor updates simultaneously resulting in usage+change of the upstream `post` model within the same render loop (add paragraph code deselected the card, starts adding new paragraph, the deselection triggered the exit-edit mode which then caused a simultaneous post update)
- passed card env through to `<KoenigEditor>` so that it can compare current payload state against the "saved" payload state to determine if it should save when leaving edit mode
- renamed `_textReplacementEditor` to `_calloutTextEditor` to better match it's usage
- removed unnecessary `onNewline` handling, it wasn't being called because we overrode `ENTER` key
refs https://github.com/TryGhost/Team/issues/1210
- when rendered, show button as greyed out if either text or url is missing
- show "Add button URL" in tooltip if the url is missing
- show "Add button text" in button if the text is missing
- adds wrapper element so the tooltip is not greyed out
