[builder] Add an entry for ROS for the PTUPosture sensor

Spotted by Lars Kunze
[bin/morse.in] 2.68 seems ok for Morse!
[actuator] new 3D sound
[sound] enable 3D effect using activate()
[geolandloader] remove Blender 2.4x code
[tools] new terrain creator tool (geotiff/dtm)
added possibility to use depth camera without publishing a TF frame
Merge branch 'master' of https://github.com/morse-simulator/morse
Merge pull request #1 from kunzel/master

latest up-upstream changes; added possibility to use depth camera without publishing a TF