Merge Eina Debug feature

Eina Debug is a layer aimed to bring a way to debug EFL applications by
providing a transport channel between a debug tool and the applications
of a device.

In order to be interrupted by EFL core as less as possible, the communication
is done in a separated thread.
The Ecore loop is not used there, as well as the Ecore helpers (socket...).

Debugging operations can be registered easily by any layer of the application.

To use it:
- Launch efl_debugd
- Launch the application to debug
- Launch Clouseau (the new version will be pushed soon) or another debug tool
supporting Eina Debug