Add embedded, gui, and simulator in same repo

gui

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+Subproject commit 12afc17f90756988b9011240e6884fa0e3fb48ef

simulator/Cargo.toml

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+[package]
+name = "gui-test"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+embedded-graphics = "0.8.1"
+embedded-graphics-simulator = "0.7.0"
+embedded-layout = "0.4.1"
+heapless = "0.8.0"
+profont = "0.7.0"
+gui = { path = "../gui/" }

simulator/src/main.rs

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+use embedded_graphics::{geometry::Size, pixelcolor::Rgb565};
+use embedded_graphics_simulator::{
+    sdl2::Keycode, OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
+};
+
+use gui::*;
+
+fn main() -> Result<(), core::convert::Infallible> {
+    let display = SimulatorDisplay::<Rgb565>::new(Size::new(240, 320));
+
+    let output_settings = OutputSettingsBuilder::new().scale(1).build();
+    let mut window = Window::new("Hello World", &output_settings);
+
+    let mut gui = Gui::new(display);
+
+    'running: loop {
+        gui.draw()?;
+        window.update(gui.display_ref());
+
+        for event in window.events() {
+            match event {
+                SimulatorEvent::Quit => break 'running,
+                SimulatorEvent::KeyDown { keycode, .. } => {
+                    let action: GuiAction = match keycode {
+                        Keycode::Left => GuiAction::Left,
+                        Keycode::Right => GuiAction::Right,
+                        Keycode::Up => GuiAction::Up,
+                        Keycode::Down => GuiAction::Down,
+                        Keycode::Return => GuiAction::Select,
+                        Keycode::Backspace => GuiAction::Back,
+                        _ => continue,
+                    };
+
+                    gui = gui.action(action);
+                    gui.fill_black()?;
+                }
+                _ => {}
+            }
+        }
+    }
+
+    Ok(())
+}