Modal views - tooltips, dropdowns, pop-overs, dialog boxes, & notifications

Creating a tooltip or dropdown or pop-over or notification library is easy enough. But I find a lot of sites get in trouble when using these patterns all together. Modals don't close when you click out of them. A dropdown appears underneath a pop-over. Modals appear on top of modals, or wipe out modals underneath. And `z-index` values grow astronomically. It can get ugly.

This library will provide a comprehensive solution for modal views. Developers will be able to use tooltips, dropdowns, pop-overs, notifications, and dialog boxes all together without having to worry about how they work.

**Add your +1** if you'd like to see Metafizzy release this Modal views library.

The issue names no files, tests, or entry points; begin by clarifying the proposed modal views library's scope and expected interactions. Define the requirements for tooltips, dropdowns, pop-overs, notifications, and dialog boxes before implementation can be considered complete.

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