Merge remote-tracking branch 'origin/master' into feat/multi-window-support

# Conflicts:
#	Cargo.toml
#	core/src/window/icon.rs
#	core/src/window/id.rs
#	core/src/window/position.rs
#	core/src/window/settings.rs
#	examples/integration/src/main.rs
#	examples/integration_opengl/src/main.rs
#	glutin/src/application.rs
#	native/src/subscription.rs
#	native/src/window.rs
#	runtime/src/window/action.rs
#	src/lib.rs
#	src/window.rs
#	winit/Cargo.toml
#	winit/src/application.rs
#	winit/src/icon.rs
#	winit/src/settings.rs
#	winit/src/window.rs

core/src/window/settings.rs

@@ -0,0 +1,76 @@
+use crate::window::{Icon, Level, Position};
+
+pub use iced_winit::settings::PlatformSpecific;
+
+/// The window settings of an application.
+#[derive(Debug, Clone)]
+pub struct Settings {
+    /// The initial size of the window.
+    pub size: (u32, u32),
+
+    /// The initial position of the window.
+    pub position: Position,
+
+    /// The minimum size of the window.
+    pub min_size: Option<(u32, u32)>,
+
+    /// The maximum size of the window.
+    pub max_size: Option<(u32, u32)>,
+
+    /// Whether the window should be visible or not.
+    pub visible: bool,
+
+    /// Whether the window should be resizable or not.
+    pub resizable: bool,
+
+    /// Whether the window should have a border, a title bar, etc. or not.
+    pub decorations: bool,
+
+    /// Whether the window should be transparent.
+    pub transparent: bool,
+
+    /// The window [`Level`].
+    pub level: Level,
+
+    /// The icon of the window.
+    pub icon: Option<Icon>,
+
+    /// Platform specific settings.
+    pub platform_specific: PlatformSpecific,
+}
+
+impl Default for Settings {
+    fn default() -> Settings {
+        Settings {
+            size: (1024, 768),
+            position: Position::default(),
+            min_size: None,
+            max_size: None,
+            visible: true,
+            resizable: true,
+            decorations: true,
+            transparent: false,
+            level: Level::default(),
+            icon: None,
+            platform_specific: Default::default(),
+        }
+    }
+}
+
+impl From<Settings> for iced_winit::settings::Window {
+    fn from(settings: Settings) -> Self {
+        Self {
+            size: settings.size,
+            position: iced_winit::Position::from(settings.position),
+            min_size: settings.min_size,
+            max_size: settings.max_size,
+            visible: settings.visible,
+            resizable: settings.resizable,
+            decorations: settings.decorations,
+            transparent: settings.transparent,
+            level: settings.level,
+            icon: settings.icon.map(Icon::into),
+            platform_specific: settings.platform_specific,
+        }
+    }
+}