platform: move platform lib bits into platform module

src/platform/mod.rs

@@ -0,0 +1,12 @@
+#[cfg(feature="embedded-graphics")]
+pub mod embedded_graphics_lib;
+
+#[cfg(feature="smart-leds")]
+pub mod smart_leds_lib;
+
+use crate::render::{Surface, Display};
+use crate::task::Task;
+
+pub trait DisplayInit {
+    fn new_display<S: Surface>() -> impl Display<S> + Task;
+}