[feature] Open link targets in the editor

[lofidevops]

If I am busy editing alpha.md with the following content:

---
layout: page
title: Alpha
---

If you like Alpha, you'll **love** [Beta](beta.md)

I would like to right-click on beta.md and pick "Edit file" from the context menu. This would close alpha.md and open beta.md in the editor. A keyboard shortcut would also be an option.

This would make it easier to hop between files when there are a large number of files in the folder, and the filenames are not immediately obvious.

[kmwallio]

If you have the preview open, I believe clicking the link in the preview should open beta.md for editing.

I'll look into if we can get a right-click menu option working.

[lofidevops]

FWIW I tried the workflow you mentioned and it didn't work:

1. Opened a preview of Alpha
2. Clicked on the link to Beta
3. Got some "Application is taking a long time" popups
4. ThiefMD crashed

Let me know if this is worth reporting as a separate issue.

[lofidevops]

I think this is just a specific instance of #150 (local link rather than hyperlink)