Applying stash from before merge. Const-ing. Updating enlil asset and scene. Change calculation of BSTNodesLeafs Some cleanup.

# Conflicts:
#	openspace.cfg
#	src/rendering/abufferrenderer.cpp

Make it possible to click on the friction markers in the image to toggle the friction (closes issue #576)

Remove identifier from VirtualPropertyManager
Add VirtualPropertyManager to the query of allProperties

* Add commandline argument that applies a Lua script to the configuration

Cleanup OpenSpaceEngine
Cleanup RenderEngine
  * ScreenSpaceRenderables are now owned by RenderEngine, rather than being shared_ptr
Cleanup LogFactory

Updated to new Ghoul commit

* Fixed interaction of trail points with ATM.
* Added fix from SunEarh day.

 * Switch openspace.cfg file from a Dictionary-based loading to a variable based loading
 * Change ConfigurationManager to not use Dictionary anymore, but a struct with explicit configuration values instead

* Add ability for Joystick input
* Change location of LuaConsole files

 * General Code Cleanup
 * Add check for TABs to check_style_guide.py
 * Removing warnings

Forward mouse-released events to the navigation handler regardless of whether a callback has consumed them

* Add function to optionally automatically create focus nodes based on info files

* Add initializeGL and deinitializeGL methods to OpenSpaceModule Call releaseAll from ProgramObjectManager in deinitializeGL to guard against errors when deinitializing assets

* Change removeProgramObject function in RenderEngine to take a non-owning pointer instead of a reference to a unique pointer to make it compatible with the ProgramObjectManager
Update Ghoul repository

* Using ProgramObjectManager in more modules to reduce the number of programs compiled at startup

Prevent floating point over- and underflows; specifically when interpolating the camera position (closes #575)

Pass radius of planets into the skirt length computation rather than use a fixed minimum length (fixed #582)

Use Memory Mapping functions in ShenTSP. Build TSP Header offset into the voxel data array pointer instead of adding it; also prevents problems if Header size changes.