Added the ability to change checkbox icon

examples/checkbox/Cargo.toml

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+[package]
+name = "checkbox"
+version = "0.1.0"
+authors = ["Casper Rogild Storm<casper@rogildstorm.com>"]
+edition = "2021"
+publish = false
+
+[dependencies]
+iced = { path = "../.." }

examples/checkbox/README.md

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+## Checkbox
+
+A box that can be checked.
+
+The __[`main`]__ file contains all the code of the example.
+
+You can run it with `cargo run`:
+```
+cargo run --package pick_list
+```
+
+[`main`]: src/main.rs

examples/checkbox/src/main.rs

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+use iced::widget::{checkbox, column, container};
+use iced::{Element, Font, Length, Sandbox, Settings};
+
+const ICON_FONT: Font = Font::External {
+    name: "Icons",
+    bytes: include_bytes!("../fonts/icons.ttf"),
+};
+
+pub fn main() -> iced::Result {
+    Example::run(Settings::default())
+}
+
+#[derive(Default)]
+struct Example {
+    default_checkbox: bool,
+    custom_checkbox: bool,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Message {
+    DefaultChecked(bool),
+    CustomChecked(bool),
+}
+
+impl Sandbox for Example {
+    type Message = Message;
+
+    fn new() -> Self {
+        Default::default()
+    }
+
+    fn title(&self) -> String {
+        String::from("Checkbox - Iced")
+    }
+
+    fn update(&mut self, message: Message) {
+        match message {
+            Message::DefaultChecked(value) => self.default_checkbox = value,
+            Message::CustomChecked(value) => self.custom_checkbox = value,
+        }
+    }
+
+    fn view(&self) -> Element<Message> {
+        let default_checkbox =
+            checkbox("Default", self.default_checkbox, Message::DefaultChecked);
+        let custom_checkbox =
+            checkbox("Custom", self.custom_checkbox, Message::CustomChecked)
+                .icon(checkbox::Icon {
+                    font: ICON_FONT,
+                    code_point: '\u{e901}',
+                    size: None,
+                });
+
+        let content = column![default_checkbox, custom_checkbox].spacing(22);
+
+        container(content)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .center_x()
+            .center_y()
+            .into()
+    }
+}