Updated Midi plug in for Pitch Wheels containing 2 bytes

The Pitch Wheel handler did not properly handle the required 2 data byte
fields. Pitch Wheel always has 2-bytes, but previous code did use them
both.
Merge pull request #240 from PRICOM/master

Updated Midi plugin for Pitch Wheels containing 2 bytes
MIDI plugin: Linux support for pitch wheel and note/channel aftertouch.

Pitch bend is tested, aftertouch not.
NEW: Input profile for BCF2000 in Mackie Control mode

In comparison to "normal" mode, all buttons are usable.
Two leftmost encoder groups buttons are shifts.