Motordefault: Added incIcon decIcon swapIncDec

This MR provides extra options to allow to set bigger icons for motor steps.

It is evilly used by the tomo application as each motor roles and direction are properly defined.

Here you can see the result, but as you can see

• There is an gap which could be removed.
• Maybe the icons should also use the fa-fw decorator?
• Instead of fa-${props.decIcon}, the prop should use fa-something (so what we can use fam-something) (also for consistency with the layout icons)

Tell me what you think i can change it.