added base mechanism for trigger out gate mode
Dedicated parameter still missing.
added gate mode variable and set gate mode function for trigger IO
added trigger gate mode menu entries and parameter.
parameter handler still missing
moved trigger gate mode param to globals
implemented gate mode handler
generate no new trigger for notes with velocity=0
updated version number to 0.31
0.31 firmware image with variable gate length for trigger IO
bound trigger gate mode to amp eg of the individual voices
added all triggers off when stopping the sequencer
new firmware image 0.31