control character expansion in wwwrite()

control character expansion in wwwrite()
calling of wwupdate() in wwwrite() dependent of ww_noupdate
control character handling macros in char.h

SCCS-vsn: usr.bin/window/main.c 3.21
SCCS-vsn: usr.bin/window/wwinit.c 3.17
SCCS-vsn: usr.bin/window/wwmisc.c 3.6
SCCS-vsn: usr.bin/window/ww.h 3.28
SCCS-vsn: usr.bin/window/cmd.c 3.27
SCCS-vsn: usr.bin/window/cmd1.c 3.23
SCCS-vsn: usr.bin/window/wwwrite.c 3.19
SCCS-vsn: usr.bin/window/wwgets.c 3.5
SCCS-vsn: usr.bin/window/cmd2.c 3.27
SCCS-vsn: usr.bin/window/wwlabel.c 3.11
SCCS-vsn: usr.bin/window/startup.c 3.10
SCCS-vsn: usr.bin/window/error.c 3.8
SCCS-vsn: usr.bin/window/:ww 1.8
SCCS-vsn: usr.bin/window/cmd6.c 3.9
SCCS-vsn: usr.bin/window/lcmd1.c 3.21
SCCS-vsn: usr.bin/window/win.c 3.7