New display mode and few features

[ssslllaa]

Hi! I really like using memos, but I really miss the multi-column note display mode so that more notes fit on the screen.
The filter block and the search could be moved closer to the edge of the screen, then 2-3 columns would fit.

It would also be great to refine the search:

• so that you don't have to press enter, and as soon as you start typing, only suitable notes would remain on the screen
• case-insensitive search

And add text copying from a note if it highlights in single quotes.