* 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
* 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
* 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
* Change to new logging format (closes#542)
* Adds a screenshots folder that uses the application startup time
* Creating focus nodes for VRT files if the info files contain location information
* Fix issue with removing virtual properties
* Add a method for returning the cartesian coordinates for a geolocation on a planet
* Rename OnScreenGui module to ImGui
* Support multiple external module folders (closes#31)
* Cleaning up CMake files
* Restructure application specification
* Add parameter for library mode to all modules
* Add functions to handle global variable state
* Misc/remove warnings (#383)
* Increase build timeout and do a clean rebuild every commit
