* Added property for aspect ratio
* Working version with aspect ratio slider controlling the FOV, and also gets updated by a window resize.
* Created horizontal fov property / GUI control that preserves aspect ratio by adjusting vertical fov to match, and updates with window resizing.
* Cleanup
* CMake cleanups
* Update current year
* Update copyright header
* Use script to return list of all modules
* Update credits, license and ghoul
* Move SGCT external library from ext/sgct to apps/OpenSpace/ext/sgct
* Remove all GLFW dependencies from openspace-core
* Add MinVR dependency
* Add new executable OpenSpace-MinVR that uses MinVR instead of SGCT
* Move global objects out of OpenSpaceEngine
* General cleanup of main.cpp
* Add default_joystick asset to all scenes
* No longer suppress mouse interaction on slave nodes
* Window delegate uses function pointers rather than subclassing
* Fix for false overwriting of ImGUI configuration file
* Change default color and tilt angle of fisheye rendering
* Restructured performance manager
* Simplify screenshot handling
