Switch from TraCIAPI to libsumo and/or libtraci

[riebl]

The TraCIAPI has been marked as deprecated by SUMO from version 1.9.0 on. We will have to switch to the newer libsumo and/or libtraci in the foreseeable future because we cannot expect any feature updates for TraCIAPI anymore.

Some users seem to have demand for features missing in the venerable TraCIAPI, e.g. #212.

[Enough7]

#212 is a dead link, what was the content of the issue?

[riebl]

I cannot recall the details anymore. One of the limitations has been the lack of support for SUMO's GUI back then. This might have changed meanwhile.