Use Frame for rendering instead of Buffer

examples/hello_world.rs

@@ -1,32 +1,32 @@
 use std::io;
 
 use crossterm::style::{ContentStyle, Stylize};
-use toss::buffer::Pos;
+use toss::frame::Pos;
 use toss::terminal::Terminal;
 
 fn main() -> io::Result<()> {
     // Automatically enters alternate screen and enables raw mode
-    let mut term = Terminal::new(Box::new(io::stdout()))?;
+    let mut term = Terminal::new()?;
 
     // Must be called before rendering, otherwise the terminal has out-of-date
     // size information and will present garbage.
     term.autoresize()?;
 
-    // Render things to the buffer
-    let b = term.buffer();
-    b.write(
+    // Render stuff onto the next frame
+    let f = term.frame();
+    f.write(
         Pos::new(0, 0),
         "Hello world!",
         ContentStyle::default().green(),
     );
-    b.write(
+    f.write(
         Pos::new(0, 1),
         "Press any key to exit",
         ContentStyle::default().on_dark_blue(),
     );
-    b.set_cursor(Some(Pos::new(16, 0)));
+    f.show_cursor(Pos::new(16, 0));
 
-    // Show the buffer's contents on screen
+    // Show the next frame on the screen
     term.present()?;
 
     // Wait for input before exiting