## Link to GitHub Issue or related Pull Request, if one exists
n/a
## Description of change
Create three distinct layers for the overlay:
1. Bottommost persistent layer - non-interactable layer that is always
on. This was only for notifications, but now the FPS widget lives here
as well.
2. Overlay windows layer - most interactable windows go here.
3. Topmost main menu - this is reserved for the main menu (escape key)
and this is a modal dialog that occludes the layers below.
Why?
- `toggle overlay` behavior with FPS widget *also* toggling on/off was a
bit confusing (now they're two separate keys)
- FPS widget is popular, but it caused the entire overlay to be active,
which affects how input is handled
- the main menu being a standalone window was a little awkward (now it's
a modal)
## Testing
## Link to GitHub Issue or related Pull Request, if one exists
n/a
## Description of change
Adds toast notifications to the overlay.
Toast notifications are transient windows (shown for about 4 seconds).
These are drawn on top of the game even when the overlay is inactive
(i.e., when no window is open), and does not cause any input sink
behavior.
Add toasts for some common user-driven actions that could use a
notification, such as:
* screenshot
* card insert
* PIN macro
* API client connect/disconnect
* virtual printer
* screen resize toggle / scene switch
Add an option to change where the toasts are displayed, or to turn it
off entirely.
Add SDK function for it, and add it to the samples.
## Testing
Tested DDR (shown at bottom right, as is for most games) and RB (shown
top right by default).
bicarus