HiHat Closed, Half-Opened, Opened

[blablack]

DIscussion with @mauser

Hydrogen only deals with close/open for the hihat control. It should
be easy enough to mark the instruments as being part of a hihat and
provide for each hihat instruments a range to define which one is
triggered. For example close from 0 to 10, half-open from 11 to 40,
open from 41 to 127.

EDrum sends a cc message for how close the hihat is closed.

There is already a script to do something very similar
(http://www.hydrogen-music.org/hcms/node/2807) using mididings, but
having it in Hydrogen would be more user friendly I guess?
This would be really handy. I'm one of the hydrogen devs and i had a look into
this problem some years ago.. At that time i was experimenting with a roland edrum
and ran into the same issue. But i switched back to accoustic drums and got rid of that
problem the easy way :) What i was asking myself at that time: Is there a standard way
of sending hihat pressure information?? IIRC the roland was sending similar CC messages.

[blablack]

This enhancement should be fixed by:
#167