First pass of character data viewer

src/window.rs

@@ -1,4 +1,5 @@
 pub use about::AboutWindow;
+pub use character_data::CharacterDataWindow;
 use egui::{Context, ViewportBuilder, ViewportId};
 pub use game::GameWindow;
 pub use gdb::GdbServerWindow;
@@ -8,6 +9,7 @@ use winit::event::KeyEvent;
 use crate::emulator::SimId;
 
 mod about;
+mod character_data;
 mod game;
 mod game_screen;
 mod gdb;