Adding modding folder with a hacked build.

modding/hacked/ss1/content/archive/level/Direction.go

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+package level
+
+// Direction is an enumeration of cardinal and ordinal directions.
+// Cardinal directions describe sides, ordinal directions describe corners.
+type Direction byte
+
+// Plus is a shortcut for dir.AsMask().Plus(other).
+func (dir Direction) Plus(other Direction) DirectionMask {
+	return dir.AsMask().Plus(other)
+}
+
+// AsMask returns the direction as a mask.
+func (dir Direction) AsMask() DirectionMask {
+	return DirectionMask(1 << dir)
+}
+
+// Offset returns a direction that you reach by offsetting this one by the given value.
+// The direction goes in a circle, and both positive and negative offsets are allowed.
+func (dir Direction) Offset(offset int) Direction {
+	return Direction((int(dir) + ((8 + (offset % 8)) % 8)) % 8)
+}
+
+// DirectionMask is a bitfield combination of directions.
+type DirectionMask byte
+
+// Plus adds the mask of the given direction to this mask and returns the result.
+func (mask DirectionMask) Plus(dir Direction) DirectionMask {
+	return mask | dir.AsMask()
+}
+
+// Direction constants are listed below.
+const (
+	DirNorth Direction = iota
+	DirNorthEast
+	DirEast
+	DirSouthEast
+	DirSouth
+	DirSouthWest
+	DirWest
+	DirNorthWest
+)