T14a Tables core: DataTable, Table, HeatmapTable, cells, Sparkline (review pending: codex 401)

src/tables/mod.rs

@@ -0,0 +1,11 @@
+mod body;
+mod cell;
+mod model;
+mod simple;
+mod table;
+#[cfg(test)]
+mod tests;
+
+pub use cell::{Aggregate, Align, Cell, Column};
+pub use simple::{HeatmapTable, Table};
+pub use table::{DataTable, Row};