Allow merge notes using commands

[robsonsobral]

Hi!

I've been testing this plug-in over the past few days.

Thank you for creating it!

May I suggest you an improvement?

Sometimes, we may want to merge notes. So, could it have commands, like Telegram bot commands?

For example, we could submit /open, then some messages, and /close. Or, /start and /end. Or something like that.

I could try submitting a PR, if you're willing to accept the suggestion.

In any case, thank you again!

[hmnijp]

I was also thinking about how to combine notes (for example, a forwarded chat between several people)
#293

I also encountered the problem that there's no simple way to merge YAML. A good solution would be to run app.fileManager.processFrontMatter on the templates. Or simply pass everything to the "templater" script - that would greatly expand the functionality of templates..