remove forward stuff from defs.h
remove defs.h from local.c and forward.c

The local tracer now waits for the remote tracer to connect,
that's no more the other way around.

All the remote tracers (textlog, enb, vcd) have also been converted.

- array of plots
- deal with colors

- update X events management
- lock to protect data while plotting (may become a problem in the future)
- better naming of dimensions

this commit should be cut in small pieces
bah

- add on/off command line options

only works for 5MHz (7680 samples per TTI), one transport block
(basic FDD thing)