QWERTY step jump sequencer #22

Some ncurses-like setup to catch keyboard events.

• Assign 16 keys to gate on/off toggles: Q-I (top eight steps), A-K (bottom eight steps).
• Assign 1 key to switch between pattern vs. step jump modes.
• Assign Up/Down arrow keys to augment pitch.
• Present display of active gate/jump keys.

Pending #23