Add helper ns for Jon
Add nrepl ns for starting an nrepl server for others to use
Improve fonome history storage:

* use maps
* add more info
* teach release to know how long the button was pressed for
Don't attempt to calculate press duration if last-press event couldn't be found.
Update to new event handler remove fn name
Clean up drum ns a little and put triggers on row 6
teach jon ns to swap trigs