Monitor changes in open file and refresh

[gradha]

Sort of a followup of #48 it would be great if the editor could monitor changes to the open file and automatically update/render it in the background if there are no modifications inside the macdown editor.

[uranusjr]

I’m having difficulties trying to combine this with autosave. Detections work, but autosave would complain if I just refreshes the document directly. Still looking for a solution.

Another problem would be what to do if there are modifications inside the editor.

[salzig]

Would love to see a "read-only"/"view" mode for this, where macdown watches for changes and only shows the rendered part of the macdown window without any ability to change the file. This removes/circumvents any "editor and filesystem are both changed" problems.