Fix an OpenGL format attributes but introduced in 1ba13099.
Wasn't causing much hard, but we truncated the stencil when
multisampling was disabled.
Work around a 10.10 toolchain bug related to NSApp setDelegate.
NSApp is meant to be a shorthand for [NSApplication sharedApplication],
however there seems to have been a change causing the [NSApp setDelegate]
prototype to differ.  Use sharedApplication instead of NSApp here.
Update deps to v3_003, including libskia_skgpu.a
Add a static method for retrieving screens info.

> plask.Window.screensInfo()
[ { id: 0, width: 1280, height: 800, highdpi: 2 } ]