added back sflphone-cli

config.h.in

configure.ac

m4/readline.m4

src/audio/Makefile.am

src/gui/Makefile.am

src/gui/cli/LICENSE

src/gui/cli/Makefile.am

src/gui/cli/calls.c

src/gui/cli/calls.h

src/gui/cli/commons.h

src/gui/cli/core.c

src/gui/cli/core.h

src/gui/cli/display.c

src/gui/cli/display.h

src/gui/cli/eventloop.c

src/gui/cli/eventloop.h

src/gui/cli/globals.c

src/gui/cli/globals.h

src/gui/cli/main.c

src/gui/cli/net.c