Rename flipAlongX36 to translateAcrossField

This was a remnant of last year's code. Renamed & fixed bug so that it works. More understandable now, can be used without racking your brains out.

core/src/main/kotlin/org/atomicrobotics3805/cflib/trajectories/TrajectoryUtil.kt

@@ -36,6 +36,7 @@ val Double.switchColorAngle get () = (if (color == BLUE) this else 360 - this)
 val Double.switchApproachTangentAngle get () = (if (color == BLUE) this else this - 180)
 val Double.switchColor get () = (if (color == BLUE) this else this * -1)
 val Double.flipAlongX36 get() = (if (color == BLUE) this else 72 - this)
+val Double.translateAcrossField get() = (if (color == BLUE) this else (72 - this) * -1)
 
 /** Returns the Vector2d of a Pose2d **/
 val Pose2d.v : Vector2d get() = (this.vec())
@@ -48,4 +49,4 @@ fun Pose2d(matrix: OpenGLMatrix) = Pose2d(
     matrix.translation.get(1).toDouble().mmToInches,
     Orientation.getOrientation(matrix, AxesReference.EXTRINSIC, AxesOrder.XYZ, AngleUnit.DEGREES)
         .thirdAngle.toDouble().toRadians
-)
+)