TODO

* Fix physics and rendering integration
* Add system simulation for spacecrafts
* Reorganise source
        /cmake          Auxiliary build scripts
        /lib            Libraries
        /lib/mediaload  Image, 3d model and audio loading library
        /lib/gencds     Generic DS library
        /lib/res        Resource manager library (depends on media load)
        /include        Open Orbit public includes
        /tools          Build tools
        /src            main source
        /src/physics    Source Related To physics
        /src/sg         Source related to scene graph / rendering system
        /src/sim        Simulation logics (systems simulation, sim loop etc)
        /src/common     Common stuff (byte swapping, large world coordinates et.c.)
        /plugins        Source for stand alone plugins
        /rsrc           Resources
        /scripts        Scripts to be included in Open Orbit
        
* Move physics system to be part of a more generic scale-graph, a scale graph has objects and positions relating to parent systems

* Add VSOP84 and ELP2000 support for Sol system.

* Per object lighting

* Atmosphere shader

* Particle system for smoke and flame

* Aerofoil simulation

* Cockpits in 2D and 3D

* Launcher models and simulation code
    * Mercury
    * Gemini
    * Apollo with moon lander
    * Shuttle
    * Soyuz
    * Ariane with human rated capsule
    * Skylon

* Fix resource loading on linux

  We can look up the install path using readlink(/proc/self/exe), if this fail
  fallback to the configure install base.