AIRO-331a Adding smoke tests and Yamato hooks

By default, Yamato will run on every commit added to a PR after the PR is created. We'd rather just have it run on the latest commit.

Hack wasn't necessary but forgot to remove it.

Our packages don't have any automated testing. This commit adds
CI boilerplate and a handful of trivial test cases. Tested via the
Yamata GUI.

https://jira.unity3d.com/browse/AIRO-331

* Auto importing modules (#24)

Co-authored-by: Devin Miller <devin.miller@unity3d.com>
Co-authored-by: flonou <florian.nouviale@inria.fr>

* Renaming and reorganizing package to better catkinify/pep8ify
* Commands Unity can send to manage the ROS endpoint
* Unregister the old handler when a new one is registered (#21)
* Rewrite server core loop
* Handle socket timeout
* Remove the pointless threads list
* Start the server on its own thread

Co-authored-by: Devin Miller <devin.miller@unity3d.com>

* Handle socket timeout
* Remove the pointless threads list
* Start the server on its own thread

Delete __init__.py

Removing extraneous dangling init file.

Commands Unity can send to manage the ROS endpoint

AIRO-315 PEP-8ifying and cleaning up Python code

Now that our code is public it needed to be brought more in line with what python/ROS-familiar developers might expect. Updated module and class names to follow more pythonic conventions, added appropriate classes to the init file, re-structured the repository to look more like a standard catkin package, and cleaned up the CMakeList and package.xml cruft.

Tested by running through Part2 of the tutorial and seeing received messages on ROS Melodic.

ROSConnection runs a single listen server, auto determine IP

Clean up unused import (Python 3 compatibility)

AIRO-291 Changing License to Apache 2.0

Co-authored-by: mpinol <michaelp@unity3d.com>

Co-authored-by: mpinol <michaelp@unity3d.com>

Co-authored-by: mpinol <michaelp@unity3d.com>

Co-authored-by: mpinol <michaelp@unity3d.com>