no issue
- Added a language indicator when in rendered mode and a language input when in edit mode
- Allow code card language to be set with <code>```lang</code>+<kbd>Space/Enter</kbd> expansion
- previously <code>\`\`\`</code> would immediately create a code card, the <kbd>Space/Enter</kbd> is now necessary for the insertion to occur
- lang is optional <code>\`\`\`</code>+<kbd>Space/Enter</kbd> will insert a code card with no language selected
- requires <kbd>Enter</kbd> to be pressed to finalise the expansion and insert the card
- added hook for text expansions to skip newline creation for when they are triggered with <kbd>Enter</kbd>
- Set the code card editor's language mode based on selected language
- set the CodeMirror mode based on the code card payload language
- add a basic map of language short codes to their respective CodeMirror modes
- observe `mode` property in `{{gh-cm-editor}}` so that the mode is properly set when it's changed after initial render
