Separate out ROS dependencies, create second pip package

[Achllle]

Description

This breaks out the ROS conversion methods into a separate pip package while the underlying dual quaternion core code becomes ROS independent and purely pythonic. This means that non-ROS users can enjoy the power of dual quaternions as well.

This is a breaking change since the API changes. ROS projects using this repo should change their code from:

from dual_quaternions_ros import DualQuaternion
dq = DualQuaternion.from_ros_pose(my_pose_msg)

to:

import dual_quaternions_ros
dq = dual_quaternions_ros.from_ros_pose(my_pose_msg)

The dq objects are still of class DualQuaternion and all methods can still be accessed through that. For other constructors, you will need to from dual_quaternions import DualQuaternion.

close #42

TODO

• dependencies of ros pip package need to be updated to include geometry msgs and dual_quaternions

[Achllle]

will probably want to add Python3 support for the standalone dual_quaternions package once this is in

[mjsobrep]

if someone just wants to install, they don't want to dig into the folders. Would be good to have the quick install instructions on the front page readme with links to more details if needed.

[Achllle]

Would be good to have the quick install instructions on the front page readme with links to more details if needed.

Done. Was going to add after posting the package on pip but might as well set it up now.

[Achllle]

Opened a PR on rosdep: rosdep/#23261

[mjsobrep]

Ok, this is far from the best review that I have ever done. I need to plug it in and test a bit more, but I don't see anything worrying. So should be good to go. I made comments for things that I would improve, but I don't think they are critical enough to not merge in.