lib: move curses to lib/

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/examples/leapfrog/curses.nit b/lib/curses/curses.nit
similarity index 100%
rename from examples/leapfrog/curses.nit
rename to lib/curses/curses.nit

diff --git a/examples/leapfrog/curses.nit.args b/lib/curses/curses.nit.args
similarity index 100%
rename from examples/leapfrog/curses.nit.args
rename to lib/curses/curses.nit.args

diff --git a/examples/leapfrog/curses.nit.c b/lib/curses/curses.nit.c
similarity index 100%
rename from examples/leapfrog/curses.nit.c
rename to lib/curses/curses.nit.c

diff --git a/examples/leapfrog/curses.nit.h b/lib/curses/curses.nit.h
similarity index 100%
rename from examples/leapfrog/curses.nit.h
rename to lib/curses/curses.nit.h