Create iced_widget subcrate and re-organize the whole codebase

lazy/src/cache.rs

@@ -1,13 +0,0 @@
-use iced_native::overlay;
-use iced_native::Element;
-
-use ouroboros::self_referencing;
-
-#[self_referencing(pub_extras)]
-pub struct Cache<'a, Message: 'a, Renderer: 'a> {
-    pub element: Element<'a, Message, Renderer>,
-
-    #[borrows(mut element)]
-    #[covariant]
-    overlay: Option<overlay::Element<'this, Message, Renderer>>,
-}