Improving configuration support (#5)

* Adding velocity config on a per-midi-channel basis.

* Adding long button press

*  Committer: lefty71

 Adding MidiUSB SysEx capabilities
 Cleaning up int alignment issues

*  Committer: lefty71

 Refactoring out sysex code into it's own class

*  Committer: lefty71

 moving references to statusLED out of dataSysEx.hpp

*  Committer: lefty71

 save the velocity configuration on a per-pin basis

*  adding hum program mode

 Committer: lefty71

*  changing vendor ID to a 3 byte code

 Committer: lefty71

* changing the long press timing to three seconds.

* adding pitch control to hum mode

* Adding support for getting version via SysEx