test with two lights
add server to interface the usb dmx controler
add the open dmx usb controler
add build/ to ignore list
change the generalisation system for dmx cable
change comment
remove from cuecable the old generic interface
send dmx data to dmx server

Its replace the direct connection the cable. We send a 513 bytes package
to the server which its send on the wire.
flush the buffer to get the very last packet sent
add the forgotten include files
add dmx_server at compile cycle
change slitly the refresh frequency of all lights
fix : send_dmx send wrong data

send_dmx function sends data from lua and apply and scale this data to
fit from 0 to 255. But some case it is not necessary, so I decide to put
the scale in lua.
Do the principal lua function non-blocking

That permit to execute other c function during the lua execution
Make the lua rt_time function non blocking
Add function to print a table has lua read it
Add set lights by cue