[Feature] Smart Search

[ssakhavi]

I've been following typora's development for a few months and I appreciate all the effort the team is putting new features. Minimalism is the philosophy behind your software but I would like to suggest something that can take your software to a whole new level.

Given the advent of machine learning algorithms in NLP and also, already available packages for smart language processing, I would suggest that the team adds Smart Search:

1. The ability to type in what and where and when we're looking for a certain thing, all from the search bar using Natural Language
2. The ability to find related notes/topics based on similarity.

This smart way can also be added during the writing experience. For example, some identifier plus "Today" can replace the date in the text.

Just something for you guys to consider.