Implement note revision diff for text and code notes

[zadam]

depends on #333

[meichthys]

I just came here to request this but realized it was already an issue. My use case would primarily need a diff between the current note and the selected revision. Bonus: If two revisions could also be diffed.

[meichthys]

This may fall under a different feature request and is probably much more difficult than it seems, but it would also be neat if the gutter of a note could show that a line has been recently changed. I'm envisioning something like:

[deajan]

I'd love to see that feature too. I'm using trilium to store some config files, and seeing differences in diff format would make things really easy for me.

[meichthys]

Trilium has entered maintenance mode. Future enhancements will be addressed in TrilumNext: https://github.com/TriliumNext/Notes/issues/84