How to show modal window in SwiftUI for macOS

Issue #768

Use custom NSWindow, set level in becomeKey and call NSApp.runModal to show modal

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final class ModalWindow: NSWindow {
override func becomeKey() {
super.becomeKey()

level = .statusBar
}

override func close() {
super.close()

NSApp.stopModal()
}
}

let window = ModalWindow(
contentRect: .zero,
styleMask: [.titled, .closable],
backing: .buffered,
defer: false
)

window.titlebarAppearsTransparent = true
window.title = "Manage collections"

window.center()
window.isReleasedWhenClosed = false
self.window = window
let view = CollectionSettingsView(store: Store.shared)
.padding()
.frame(
width: Constants.settingsViewWidth,
height: 350,
alignment: .topLeading
)
let hosting = NSHostingView(rootView: view)
window.contentView = hosting
hosting.autoresizingMask = [.width, .height]

NSApp.runModal(for: window)

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