remove modules and have single event manager (atomics feature parity + preparation for local state)

core/src/widget/mod.rs

@@ -1,11 +1,13 @@
 use crate::{Len, Painter, SizeCtx, Ui};
 use std::any::Any;
 
+mod data;
 mod handle;
 mod like;
 mod tag;
 mod widgets;
 
+pub use data::*;
 pub use handle::*;
 pub use like::*;
 pub use tag::*;