Rewrite deprecated cross for 2D

Author: FlorianPfaff

pyrecest/filters/gprhm_tracker.py

@@ -33,7 +33,7 @@ def pol2cart(phi, r=1.0):
 
 def angle_between_two_vectors(x, y):
     dot_prod = dot(x, y)
-    cross_prod = cross(x, y)
+    cross_prod = x[..., 0] * y[..., 1] - x[..., 1] * y[..., 0]
     return -arctan2(cross_prod, dot_prod) % (2 * pi)