Share Extension: consider making the top line become the post title when sharing from Bear into the WordPress app

[designsimply]

Expected behavior

I had expected the very top Heading from Bear to become the Title of the WordPress post even though logically I see that it is labeled H1.

Actual behavior

Exporting from Bear to TXT then sharing to the WordPress app results in the title from Bear becoming a Heading in the body of the WordPress post.

Steps to reproduce the behavior

1. Open Bear and add some content.
2. Tap the (i) icon at top right.
3. Select TXT.
4. Tap the share icon at top right.
5. Select the WordPress app (must be 12.1+).
6. Tap “Next” at top right.
7. Select a site if prompted.
8. Tap “Publish” at top right.
9. View the published post in a browser or preview it in the app.

^{Tested on WP Internal 12.1.0.20190325 on iPhone 6S iOS 12.2 sharing from Bear into madefortesting190318.wordpress.com.}

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[rachelmcr]

Confirmed this is resolved when exporting the note as Markdown or TextBundle, per #11545. @nheagy is there a way for us to also do this when using the Share action (instead of exporting the note), or have we done everything we can here?