Render move data as series of arrays so we can display images w/ buttons and directions

[bdickason]

We'd like to render imagery for buttons and directions.

We're planning the following: Each comma separated command is an entry in an array (d, d/f, f, 2 becomes [d,d/f,f,2])

Each plus command becomes a nested array with comma separation (d/f,d/f+1+2 becomes [d/f, [d/f, 1, 2]])