Refactor RobotLib with plugins, pull YARP network wrapper interfaces from new repo

[PeterBowman]

Former YARP device implementations of the IRobotManager class have been migrated to a new repository (asrob-uc3m/yarp-devices#1). This centralization efforts mean that we'll no longer want to maintain duplicates in src/libraries/RobotLib, namely:

• IRobotManager.hpp should disappear, all copies will be overhauled by IRobotManager.hpp@yarp-devices
• YarpRobotManager is a dupe of RobotClient implemented as a static library (changes should be performed to handle a DL module now)
• MockRobotManager should be transferred into a new YARP device

Aditionally, YCM will take care of the build automatization. Specifically, that single header (for now!) would be pulled and configured by YCM if not found on the system (according to YCM standards, we'll need a BuildASROB_YARP_DEVICES.cmake). We can take advantage from some ideas laid out at roboticslab-uc3m/questions-and-answers/issues/44 (interface targets).

[PeterBowman]

Updated CMake configuration of device repo at asrob-uc3m/yarp-devices@19b5e12.

[PeterBowman]

I'll leave some lines for the automation of color-debug via YCM. The actual migration may/will happen at #123.

[PeterBowman]

Mixing YCM with interface targets (in order to propagate the path to IRobotManager.h from asrob-uc3m/yarp-devices) was quite messy. I summed it up and left some hopefully useful pointers at https://github.com/roboticslab-uc3m/developer-manual/issues/18#issuecomment-365926298.