refs https://github.com/TryGhost/Ghost/issues/9505
- use Spirit classes for card context menu
- add button and icon class options for context menu items
- add ability to have icon+text for context menu items
- add "Edit" context menu item to markdown and html cards
refs https://github.com/TryGhost/Ghost/issues/9311
- add actions for cursor movement and pass through to card components
- `moveCursorToNextSection` deselects card and places cursor at beginning of next section, useful for caption inputs where <kbd>down arrow</kbd> or <kbd>right arrow</kbd> should move the cursor out of the input & card. Also creates an empty paragraph before moving the cursor if for some reason an empty paragraph doesn't exist after the last card in the doc
- `moveCursorToPrevSection` deselects card and places cursor at end of previous section, useful for caption inputs where <kbd>up arrow</kbd> or <kbd>left arrow</kbd> should move the cursor out of the input & card
- `addParagraphAfterCard` deselects card, creates a new paragraph after the card and moves the cursor to it. Useful for caption inputs where <kbd>enter</kbd> should have the same behaviour as if it was pressed whilst the card is selected
- modify `{{gh-uploader}}` so that it passes the FileList to it's `onStart` closure action. Useful for displaying previews when uploading images
- modify `{{koenig-card}}` toolbar display so that it can display text as well as icon buttons
- update `{{koenig-card-image}}` so that it has a full image uploader and caption input
refs https://github.com/TryGhost/Ghost/issues/9311
- adds the `koenig-card-image` card that renders an `<img>` element
- adds text expansion to convert markdown images into the new image card
