yoda: warning cleanup sweep (dead code + clippy --fix) (squashed)

Squash of 4 yoda commits:
- 84437e21 yoda: libcosmic-yoda dead-code purge (14->0 warnings)
- 999db0a4 yoda: cosmic-theme cleanup (4->0 warnings) — workspace at 0 warnings total
- 4743bb8e yoda: cargo clippy --fix on libcosmic-yoda (115->33 warnings)
- 675f3b59 chore: reduce local stack warnings

src/lib.rs

@@ -63,6 +63,17 @@ pub mod font;
 
 #[doc(inline)]
 pub use iced;
+#[doc(inline)]
+pub use iced_core;
+#[doc(inline)]
+pub use iced_futures;
+#[doc(inline)]
+pub use iced_runtime;
+#[doc(inline)]
+pub use iced_widget;
+#[doc(inline)]
+#[cfg(feature = "wayland")]
+pub use iced_winit;
 
 pub mod icon_theme;
 pub mod keyboard_nav;