Add support for searching and loading ROS libraries automatically

[v-lopez]

Adding this to a package.xml

<export>
    <behaviortree_cpp bt_lib_plugin="lib_with_plugins" />
 </export>

Is enough for this function to find lib_with_plugins.so and load it.

[v-lopez]

I'm happy to write a unit test for this, I just like to know if this will make it here or if we should put it somewhere else.

[facontidavide]

It will take me a while to focus on this. I am 100% working on Groot. But thanks for sending the PR :)

[v-lopez]

No rush, we're using this from our fork in the meantime, and when you have time we discuss whether this belongs here, or somewhere else.

[v-lopez]

This was merged to ver_3 after it had been merged into master.

Are there plans to bring these changes to master?

[facontidavide]

I will

[HansRobo]

I want to use the function BehaviorTreeFactory::registerFromROSPlugins().
But, the ver_3 branch seems already deleted.

This was merged to ver_3 after it had been merged into master.

Are there plans to bring these changes to master?

How is this plan going?