STEP definition

Defined values for step types:

STEP_NOTHING 0

STEP_FIRST 1

STEP_FORWARD 2

STEP_BACKWARDS 3

STEP_RIGHT 4

STEP_LEFT 5

STEP_UPRIGHT 6

STEP_UPLEFT 7

STEP_DOWNRIGHT 8

STEP_DOWNLEFT 9

STEP_HEAD 10