create an iliad_launch package

[marc-hanheide]

that contains the launch files for all the different sub-systems:

• core, contains main driver and sensors
• sim_core, which does the same as core for simulation
• navigation
• people_perception

For those, please consider writing TMule configs, see https://github.com/marc-hanheide/TMuLe

[MFernandezCarmona]

This turned into https://gitsvn-nt.oru.se/iliad/software/iliad_metapackage