add module system and move sensor into core with it

src/layout/mod.rs

@@ -1,11 +1,12 @@
 mod color;
+mod event;
 mod id;
 mod layer;
+mod module;
 mod num;
 mod orientation;
 mod painter;
 mod pos;
-mod sense;
 mod text;
 mod texture;
 mod ui;
@@ -14,13 +15,14 @@ mod widget;
 mod widgets;
 
 pub use color::*;
+pub use event::*;
 pub use id::*;
 pub use layer::*;
+pub use module::*;
 pub use num::*;
 pub use orientation::*;
 pub use painter::*;
 pub use pos::*;
-pub use sense::*;
 pub use text::*;
 pub use texture::*;
 pub use ui::*;