Add `on_layout` to most custom widgets

src/widgets/app.rs

+use kayak_core::OnLayout;
+
 use crate::core::{
     render_command::RenderCommand,
     rsx,
@@ -16,6 +18,8 @@ pub struct AppProps {
     pub children: Option<Children>,
     #[prop_field(OnEvent)]
     pub on_event: Option<OnEvent>,
+    #[prop_field(OnLayout)]
+    pub on_layout: Option<OnLayout>,
     #[prop_field(Focusable)]
     pub focusable: Option<bool>,
 }
@@ -32,6 +36,7 @@ pub struct AppProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ✅        |
 /// | `focusable` | ✅        |
 ///
 /// # Using the `bevy_renderer` feature

src/widgets/clip.rs

+use kayak_core::OnLayout;
+
 use crate::core::{
     render_command::RenderCommand,
     rsx,
@@ -14,6 +16,8 @@ pub struct ClipProps {
     pub children: Option<Children>,
     #[prop_field(OnEvent)]
     pub on_event: Option<OnEvent>,
+    #[prop_field(OnLayout)]
+    pub on_layout: Option<OnLayout>,
 }
 
 #[widget]
@@ -29,6 +33,7 @@ pub struct ClipProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ✅        |
 /// | `focusable` | ❌        |
 ///
 pub fn Clip(props: ClipProps) {

src/widgets/element.rs

+use kayak_core::OnLayout;
+
 use crate::core::{
     render_command::RenderCommand,
     rsx,
@@ -14,6 +16,8 @@ pub struct ElementProps {
     pub children: Option<Children>,
     #[prop_field(OnEvent)]
     pub on_event: Option<OnEvent>,
+    #[prop_field(OnLayout)]
+    pub on_layout: Option<OnLayout>,
     #[prop_field(Focusable)]
     pub focusable: Option<bool>,
 }
@@ -32,6 +36,7 @@ pub struct ElementProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ✅        |
 /// | `focusable` | ✅        |
 ///
 pub fn Element(props: ElementProps) {

src/widgets/fold.rs

+use kayak_core::OnLayout;
+
 use crate::core::{
     render_command::RenderCommand,
     rsx,
@@ -33,6 +35,8 @@ pub struct FoldProps {
     pub children: Option<Children>,
     #[prop_field(OnEvent)]
     pub on_event: Option<OnEvent>,
+    #[prop_field(OnLayout)]
+    pub on_layout: Option<OnLayout>,
     #[prop_field(Focusable)]
     pub focusable: Option<bool>,
 }
@@ -49,6 +53,7 @@ pub struct FoldProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ✅        |
 /// | `focusable` | ✅        |
 ///
 /// # Examples

src/widgets/if_element.rs

+use kayak_core::OnLayout;
+
 use crate::core::{rsx, styles::Style, widget, Children, OnEvent, WidgetProps};
 
 /// Props used by the [`If`] widget
@@ -11,6 +13,8 @@ pub struct IfProps {
     pub children: Option<Children>,
     #[prop_field(OnEvent)]
     pub on_event: Option<OnEvent>,
+    #[prop_field(OnLayout)]
+    pub on_layout: Option<OnLayout>,
     #[prop_field(Focusable)]
     pub focusable: Option<bool>,
 }
@@ -27,6 +31,7 @@ pub struct IfProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ✅        |
 /// | `focusable` | ✅        |
 ///
 pub fn If(props: IfProps) {

src/widgets/image.rs

+use kayak_core::OnLayout;
+
 use crate::core::{
     render_command::RenderCommand,
     rsx,
@@ -15,6 +17,8 @@ pub struct ImageProps {
     pub children: Option<Children>,
     #[prop_field(OnEvent)]
     pub on_event: Option<OnEvent>,
+    #[prop_field(OnLayout)]
+    pub on_layout: Option<OnLayout>,
     #[prop_field(Focusable)]
     pub focusable: Option<bool>,
 }
@@ -31,6 +35,7 @@ pub struct ImageProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ✅        |
 /// | `focusable` | ✅        |
 ///
 pub fn Image(props: ImageProps) {

src/widgets/inspector.rs

@@ -34,6 +34,7 @@ pub struct InspectorProps {
 /// | `children`  | ❌        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ❌        |
+/// | `on_layout` | ❌        |
 /// | `focusable` | ❌        |
 ///
 pub fn Inspector(props: InspectorProps) {

src/widgets/nine_patch.rs

+use kayak_core::OnLayout;
+
 use crate::core::{
     render_command::RenderCommand,
     rsx,
@@ -18,6 +20,8 @@ pub struct NinePatchProps {
     pub children: Option<Children>,
     #[prop_field(OnEvent)]
     pub on_event: Option<OnEvent>,
+    #[prop_field(OnLayout)]
+    pub on_layout: Option<OnLayout>,
     #[prop_field(Focusable)]
     pub focusable: Option<bool>,
 }
@@ -48,6 +52,7 @@ pub struct NinePatchProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ✅        |
 /// | `focusable` | ✅        |
 ///
 pub fn NinePatch(props: NinePatchProps) {

src/widgets/text.rs

@@ -40,6 +40,7 @@ pub struct TextProps {
 /// | `children`  | ❌        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ❌        |
 /// | `focusable` | ✅        |
 ///
 pub fn Text(props: TextProps) {

src/widgets/tooltip.rs

@@ -72,6 +72,7 @@ pub struct TooltipConsumerProps {
 /// | `children`  | ✅        |
 /// | `styles`    | ✅        |
 /// | `on_event`  | ✅        |
+/// | `on_layout` | ❌        |
 /// | `focusable` | ❌        |
 ///
 /// # Styles