Move low-level window width/height functions to C, and high-level functions to Lisp.
* lisp/window.el (window-total-height, window-total-width): Doc fix. (window-body-size): Move from C. (window-body-height, window-body-width): Move to C. * src/window.c (Fwindow_left_column, Fwindow_top_line): Doc fix. (Fwindow_body_height, Fwindow_body_width): Move from Lisp. Signal an error if not a live window. (Fwindow_total_width, Fwindow_total_height): Move from Lisp. (Fwindow_total_size, Fwindow_body_size): Move to Lisp.
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