I primarily removed commented code.

With these updates, the handover_object.launch demo succeeded.
The robot successfully moved its hand to me three times in a
row when I moved myself to different positions. The handoff
poses seemed good.

A variety of changes were required to make this work, including
the following:

  + tab vs. spaces cleanup for funmap using "autopep8 -i funmap"

  + updates to cython compilation for Python 3 and recent cython

  + changed import statement pattern to "stretch_funmap.*"

Prior to my successful run of this demo, I encountered an error
related to get_robot_floor_pose_xya in HelloNode in hello_misc.py
(details below). It seems like it may have been a failed transform
lookup by get_p1_to_p2_matrix, which queries TF2 to obtain the
current estimated transformation from the robot's base_link frame
to the frame.

I did not make changes that I would expect to resolve this issue.
I only added a few print statements to hello_misc.py that I
intended to use for debugging. I have left the print statements
in place.

[ERROR] [1622656837.765018]: Error processing request: matmul: Input operand 0 does not have enough dimensions (has 0, gufunc core with signature (n?,k),(k,m?)->(n?,m?) requires 1)
['Traceback (most recent call last):\n', '  File "/opt/ros/noetic/lib/python3/dist-packages/rospy/impl/tcpros_service.py", line 632, in _handle_request\n    response = convert_return_to_response(self.handler(request), self.response_class)\n', '  File "/home/ck/catkin_ws/src/stretch_ros/stretch_demos/nodes/handover_object", line 178, in trigger_handover_object_callback\n    at_goal = self.move_base.forward(self.mobile_base_forward_m, detect_obstacles=False, tolerance_distance_m=tolerance_distance_m)\n', '  File "/home/ck/catkin_ws/src/stretch_ros/stretch_funmap/src/stretch_funmap/navigate.py", line 245, in forward\n    xya, timestamp = self.node.get_robot_floor_pose_xya()\n', '  File "/home/ck/catkin_ws/src/stretch_ros/hello_helpers/src/hello_helpers/hello_misc.py", line 127, in get_robot_floor_pose_xya\n    r0 = np.matmul(robot_to_odom_mat, r0)[:2]\n', 'ValueError: matmul: Input operand 0 does not have enough dimensions (has 0, gufunc core with signature (n?,k),(k,m?)->(n?,m?) requires 1)\n']

In the process of trying to get keyboard_teleop to work,
I encountered a syntax error. It turned out to be due to
"async" being used in an argument and "async" being
a keyword in Python 3. I've replaced "async" with
"return_before_done". This is the main change in this
commit.