continued insertion testing, not sure i like this method

src/gui/Window.cc

@@ -277,6 +277,13 @@ void Window::handle_key(uint32_t scancode, uint32_t mod)
     case SDL_SCANCODE_I:
         m_buffer->piece_table->begin_insert(*m_cursor, true);
         break;
+    case SDL_SCANCODE_O:
+        m_buffer->piece_table->insert_code_point('*');
+        redraw();
+        break;
+    case SDL_SCANCODE_A:
+        m_buffer->piece_table->begin_insert(*m_cursor, false);
+        break;
     }
 }