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)

Slightly speedup application close

* Version of touch interface for user study that has disabled panning and limited zoom to prevent zooming through the planet surface

* Update starlabels.data file

* Enable minimum picking distance in NDC

* Fix stack corruption bug in TouchMarker

* Version of touch interface for user study that has disabled panning and limited zoom to prevent zooming through the planet surface

* Fix stack corruption bug in TouchMarker

* Add time limit to levmarq solver

* Add debug properties to touch GUI with a compile time flag

* Guard against accessing outside bounds

* Added exponential zoom for faster zoom with increased distance from focus node

* Refined the exponential zoom for better behavior on the touch table

* Added properties for disabling panning and node boundary sphere multiplier for zoom

* Added more debug logging and stopped using camera focusNode (looks deprecated) for distance calculation

* Found error in the deceleration algorithm

* Default-disable debug logging, exponential zoom coeff change and additional debug log statement

Modified SGCT configuration commands to allow aspect ratio tracked keyword in openspace config file (#560)

Web GUI from Klas Eskilson (three new modules: webgui, webbrowser and cefwebgui)
Parallel connection refactorization
Wormhole server added to the main repository
Transfer function editor work from Cristoffer Särevall
Update ghoul

 * Fix Triton asset file
 * Display an error if no Property matches a regex in setPropertyValue
 * Correct user-facing name for some Moon assets
 * Add fade in and fade out helping functions
 * Reenable label fading in New Horizons
 * Added GUI hint to hide uninteresting nodes
 * Set Hidden Hint on barycenter nodes

Fix Lua state leaking when setting delta time

  * Introduced guiName to PropertyOwner
  * Added requirement that PropertyOwner::identifier may not contain whitespaces
  * Changed Name to Identifier in asset and scene files
  * Added new PropertyOwner to RenderEngine that owns the ScreenSpaceRenderables
  * Moved Name and GuiPath into GUI group
  * Added user-facing names to layer groups

* Removed unused cached uniforms from execution.