Allow Notes with Date in Title to Show on Respective Day

[rsandz]

https://discourse.joplinapp.org/t/plugin-joplin-calendar-plugin/34928/6?u=rsandz

When a date is selected in the calendar, could the plugin also display notes with titles including that date?

A note about a different date than it was created or modified on would show up where expected.

For example: notes about past or future dates, or daily notes created before and modified after the date they reference.

e.g. Implement a "Related Notes" list

[rsandz]

Addressing as part of #19. However, that's still an experimental feature since there's performance issues in larger notebooks.