Rewrite Haiku frame geometry code to handle decorator frames

Rewrite Haiku frame geometry code to handle decorator frames

* doc/lispref/frames.texi (Frame Layout): Document changes to
Haiku frame layout.

* src/haiku_support.cc (class EmacsWindow, MoveToIncludingFrame)
(EmacsMoveTo, MakeFullscreen): Move to an offset including the
decorator frames.
(be_get_window_decorator_dimensions):
(be_get_window_decorator_frame): New functions.

* src/haiku_support.h: Update prototypes.

* src/haikufns.c (haiku_update_after_decoration_change): New
function.
(haiku_create_frame, haiku_set_undecorated)
(haiku_set_override_redirect): Call that function.
(frame_geometry): Actually calculate frame geometry based on
decorator and frame sizes.

* src/haikuterm.c (haiku_coords_from_parent): Use frame width
instead.
(haiku_read_socket): Set left and top positions based on
decorator width and height.
* src/haikuterm.h (struct haiku_output): New field `frame_x' and
`frame_y'.