Date autosuggest

[liamcain]

https://user-images.githubusercontent.com/693981/115917362-232fd200-a444-11eb-9d10-d6010cfde683.mp4

This is forked off my other PR, which is ready to go.

TODO

• [x] Use settings configuring the format
• [x] Should it always insert as a link? Maybe I can check if the meta key is pressed to change the functionality here
• [ ] Future idea: have it smart enough to know to link to monthly and weekly notes. This will be tricky but maybe chrono or sugar makes this easier.
• [ ] Add support for Month Day and Month Day Year

[liamcain]

I added inline instructions for preserving the alias:

Now pressing enter will insert the basic link and pressing shiftenter will insert the link with the input text as an alias.