Enable height customization

[mgrobaker]

I typically use the grid layout. Sometimes one of my Trello lists is too long and I have to scroll down in the list.

I would like to be able to resize the height of the invisible grid being used, so my lists don't overflow. In my case, I would resize the height to give each row more space.

I don't think this would need to support click and drag by the user. Instead, the feature could be to add some setting in the extension options. Then the user could specify row height. It could be a number (100px or whatever), or else a radio button/dropdown (small, medium, large)