As Hooptie, I want to have more sequence modes

[tnorris]

Acceptance Criteria

• try to stay in 6HP
• save the direction in JSON
• docs
• add button label w/ inkscape

New modes:

• forwards
• backwards
• ping pong
• random
• shotgun ("maybe" send to all snowflake outs; gonna need more dice)
• single use (need to reset at the end every sequence)

Concerns

• should there be a CV in for direction?
• should there be a LED to indicate mode (maybe by brightness?)