Extend mouse support on W32 text-mode console.

Extend mouse support on W32 text-mode console.

 src/xdisp.c (draw_row_with_mouse_face): Call
 tty_draw_row_with_mouse_face for WINDOWSNT as well.
 src/w32console.c: Include window.h.
 (w32con_write_glyphs_with_face, tty_draw_row_with_mouse_face): New
 functions.
 (initialize_w32_display): Initialize mouse-highlight data.
 src/w32inevt.c: Include termchar.h and window.h.
 (do_mouse_event): Support mouse-autoselect-window.  When the mouse
 moves, call note_mouse_highlight.  If help_echo changed, call
 gen_help_event to produce help-echo message in the echo area.
 Call clear_mouse_face if mouse_face_hidden is set in the mouse
 highlight info.

 etc/NEWS: Describe the changes.