[WIP] Catkin build 2

Depends on !86 (closed) .

[WIP] - To be tested by others.

Enable use of catkin build (catkin_tools).

It allows for a much simpler setup of the required workspace for development in wolf - see update in README.md -.

However the former compilation flow should still work. Well up to cd347095ef0dd040a706f04818f889ee4f6d80fb I guess.