Add new frame functionality to NS port

Add new frame functionality to NS port

* lisp/frame.el (frame-restack): Call ns-frame-restack.
* src/keyboard.c (kbd_buffer_get_event) [HAVE_NS]: Enable
MOVE_FRAME_EVENT handling.
* src/frame.h:
* src/frame.c: Enable 'z-group', 'undecorated' and 'parent' frame
definitions.
* src/nsfns.m: Add x_set_z_group, x_set_parent_frame and
x_set_undecorated (Cocoa only) to handler struct.
(Fx_create_frame): Handle 'z-group', 'parent-frame' and 'undecorated'
frame parameter.
(Fns_frame_restack): New function.
* src/nsmenu.m (free_frame_tool_bar, update_frame_tool_bar):
FRAME_TOOLBAR_HEIGHT is no longer a variable.
* src/nsterm.h (NS_PARENT_WINDOW_LEFT_POS, NS_PARENT_WINDOW_TOP_POS):
Add #defines to find the screen position of the parent frame.
(NS_TOP_POS): Remove defun.
(EmacsView): Remove redundant toolbar variables and add createToolbar
method.
(FRAME_NS_TITLEBAR_HEIGHT, FRAME_TOOLBAR_HEIGHT): Always calculate the
values instead of storing them in a variable.
* src/nsterm.m (x_set_offset, windowDidMove): Take parent frame
position into account when positioning frames.
(initFrameFromEmacs): Remove toolbar creation code and handle new
frame parameters.
(x_set_window_size): Remove toolbar height calculation.
(x_set_z_group):
(x_set_parent_frame):
(x_set_undecorated) [NS_IMPL_COCOA]: New function.
(x_destroy_window): Detach parent if child closes.
(updateFrameSize): Change NSTRACE message to reflect new reality and
no longer reset frame size.
(windowWillResize): Don’t change NS window name when the titlebar
is invisible.
(createToolbar): Move toolbar creation code into it’s own method.
(toggleFullScreen): FRAME_TOOLBAR_HEIGHT and FRAME_NS_TITLEBAR_HEIGHT
are no longer variables.
(windowDidMove): Fire MOVE_FRAME_EVENT Emacs event.