refs https://github.com/TryGhost/Ghost/issues/9724
- `formatMarkdown` was previously changed to return a SafeString but that meant any direct usage of the helper had to account for not dealing with a basic String type
- changed `formatMarkdown` to return a basic String
- modified helper usage of `{{sanitize-html}}` to use triple-curlies
refs https://github.com/TryGhost/Ghost/issues/9724
- `clean-basic-html` was being overzealous with it's empty element removal, often contenteditable (especially when pasting) will result in HTML such as `<span> </span>` which was being completely removed
- if an empty element has any spaces in it, replace the element with a textNode containing a single space
refs https://github.com/TryGhost/Ghost/issues/9724
- extract html sanitisation into a Koenig helper `{{sanitise-html}}` (all markdown handling will eventually move into Koenig too)
- render sanitised html in the html card
refs https://github.com/TryGhost/Ghost/issues/9724
- added `{{koenig-basic-html-input}}` component
- uses a stripped down version of Koenig
- supports all inline formatting that Koenig supports
- supports inline text expansions
- supports inline key commands
- limited to a single paragraph
- serialises and deserialises from HTML rather than mobiledoc
- updated `{{koenig-caption-input}}` to use `{{koenig-basic-html-input}}`
- updated image and embed cards to calculate word counts correctly for html captions
- bumped Spirit dependency to fix styling of toolbars within the editor canvas
- fixed positioning in toolbar components to account for `parentElement` not necessarily being the closest element to position against
no issue
- copy Spirit styles over (eventually these will live in an addon)
- update `ember-cli-build` to output a separate CSS file for Spirit
- update `asset-delivery` addon to output Spirit CSS link
- add `{{kg-style}}` helper for Spirit class names
- update `{{koenig-card}}` and the `{{koenig-card-markdown/html}}` components to use Spirit class names and markup
- replace markdown icon with new version from Spirit
