Configurable SPI bitrate and mode

[kaythe]

It would be really useful to be able to change the bitrate, and more importantly the SPI mode (Active High/Low clock, change data on active-idle or idle-active). I would have implemented it myself but this MyForth code looks like complete gibberish to me :|

[benner]

you can change mode with m (e.g. m 3). Also, mode will be shown in top left corner.