Major change in cmake setup:

 * Simox projects are not longer treated as stand-alone-projects, but as subprojects of simox. This avoids lots of confusions that have been ontroduced due to the VirtualRobot stand-alone project.
 * cmake build-config and install setup has been improved and is consistent through the whole project.
 * switched to version 2.3.0

git-svn-id: http://svn.code.sf.net/p/simox/code/trunk@466 042f3d55-54a8-47e9-b7fb-15903f145c44