Further redesign of window change functions
* doc/lispref/windows.texi (Window Hooks): Revise description of window change functions. Add documentation for 'window-state-change-hook' and window state change flag. * etc/NEWS: Update entry for window change functions. * src/frame.c (Fframe_window_state_change) (Fset_frame_window_state_change): New functions. * src/frame.h (struct frame): New boolean window_state_change. (FRAME_WINDOW_STATE_CHANGE): New macro. * src/window.c (window_change_record_frames): New static boolean. (window_change_record_frame): Remove function - code moved to window_change_record. (window_change_record): Record frame changes here taking window_change_record_frames into account. (run_window_change_functions_1): Set window_change_record_frames whenever we run one of our hooks. (run_window_change_functions): Run hooks also when FRAME_WINDOW_STATE_CHANGE has been set. Run Vwindow_state_change_hook. Leave decision whether to record changes for all frames to window_change_record. (Vwindow_state_change_functions): Update doc-string. (Vwindow_state_change_hook): New normal hook.
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