add RenderThunk, LayoutThunk, Map::new, fold some components into arranger methods

src/lib.rs

@@ -10,15 +10,7 @@ pub(crate) use ::tek_tui::{
     *,
     tek_edn::*,
     tek_layout::*,
-    tek_engine::{
-        from,
-        Usually, Perhaps,
-        Output, Content, Render, RenderBox, Thunk, render, Engine, Size, Area,
-        Input, handle, Handle, command, Command, input_to_command, InputToCommand, keymap, EventMap,
-    },
-    Tui,
-    TuiIn, key, ctrl, shift, alt, kexp, kpat,
-    TuiOut,
+    tek_engine::*,
     crossterm::{
         self,
         event::{