Implement the XTWINOPS (CSI t) control sequences that "make sense".

These sequences were implemented:

CSI 14 t - report the text area size in pixels
CSI 16 t - report the cell size in pixels
CSI 18 t - report the text area size in cells
CSI 21 t - report the window title

These sequences were not implemented because they manuipulate the window
state in ways that we do not want.

CSI 1 t
CSI 2 t
CSI 3 ; x ; y t
CSI 4 ; height ; width ; t
CSI 5 t
CSI 6 t
CSI 7 t
CSI 8 ; height ; width ; t
CSI 9 ; 0 t
CSI 9 ; 1 t
CSI 9 ; 2 t
CSI 9 ; 3 t
CSI 10 ; 0 t
CSI 10 ; 1 t
CSI 10 ; 2 t
CSI 24 t

These sequences were not implemented because they do not make sense in
a Wayland context:

CSI 11 t
CSI 13 t
CSI 14 ; 2 t

These sequences were not implemented because they provide information
about the screen that is unnecessary.

CSI 15 t
CSI 19 t

These sequences were not implemeted because Ghostty does not maintain an
icon title for windows.

CSI 20 t
CSI 22 ; 0 t
CSI 22 ; 1 t
CSI 23 ; 0 t
CSI 23 ; 1 t

These sequences were not implemented because of the additional
complexity of maintaining a stack of window titles.

CSI 22 ; 2 t
CSI 23 ; 2 t

macos/Sources/Ghostty/Ghostty.App.swift

@@ -70,6 +70,7 @@ extension Ghostty {
                 reload_config_cb: { userdata in App.reloadConfig(userdata) },
                 open_config_cb: { userdata in App.openConfig(userdata) },
                 set_title_cb: { userdata, title in App.setTitle(userdata, title: title) },
+                get_title_cb: { userdata in App.title(userdata) },
                 set_mouse_shape_cb: { userdata, shape in App.setMouseShape(userdata, shape: shape) },
                 set_mouse_visibility_cb: { userdata, visible in App.setMouseVisibility(userdata, visible: visible) },
                 read_clipboard_cb: { userdata, loc, state in App.readClipboard(userdata, location: loc, state: state) },