Remap keyboard shortcuts [including Quick Access on Mac ⌘⇧Space; customization available in nightly]

Thanks @bcrowl! Quick Access is one of the areas that is the "most new" here, and still has a lot of refinements coming so we particularly appreciate the feedback on this.

We definitely do plan to make the keyboard shortcut customizable, and even the default one is being debated a lot still. Shift+Cmd+Space was chosen because our user testing so far showed that people thought of this type of feature as being very similar to things like Spotlight, Alfred, Launchbar, Quicksilver, etc. and all of those tend to use a spacebar + modifier combination for activation. The spacebar is also one of the most easily tapped keys being right under thumbs for folks that use the "home row" technique. And when asking users "what would you expect the shortcut for this to be" (that did not already know the previous shortcuts) they most often said "something with the spacebar". The previous shortcut for mini (using \) had some issues on some non-english keyboards, and within some browsers for the extensions which caused us to rethink it. But we're still heavily considering changing this (and as I said, it'll definitely end up being customizable whatever the default is).

Regarding the two-pane vs single-pane view, and showing item previews by default ... that's a tough one. We've gone back and forth on this throughout 1Password's history and generally there seems to have been more frustration from folks with the two-pane view then when it's been single pane with just a list. The single pane view helps people feel less distracted when they just want to quickly go and fill (not yet in the new Quick Access). Or if they want to have the details stick around longer for reference. Or just quickly use a keyboard shortcut to copy a password. We're attempting to work toward making it super simple to view the details when you want them, but keep them out of the way to make the window smaller, and more focused. That being said, no decision is final and I really do appreciate the thoughtful feedback and kind words!