* Add some missing renderables
* Tiny refactor of documentation identifiers and log category keys

* Adapt to explicit specifcation of texture size

 * Revert screenlog back to showing Info and above messages
 * Various code cleanup

* Adapting to the changes in Ghoul
* First step of moving filesystem functions to std
* Remove persistence flag from cachemanager

- Make use of more codegen in more classes
- Fix verifier for Color4Verifier

 * Add the ability to automatically generate code to extract values out of a Dictionary (see https://github.com/openspace/codegen

 for more information on how to use this)
* Applied this technique to a large number of cases in the codebase
* Don't add _codegen files to the repository
Co-authored-by: Emma Broman <emma.broman@liu.se>

 * Adapting to introduction of new Dictionary class in Ghoul
 * Mainly replacing usage of float instead of doubles as expected
 * Adjust to the lack of the hasKeyAndValue function

* Cleaner handling of global state
* Prevent Lua memory corruption (closes #982)
* Initialize glfw first thing to prevent weird joystick loading bug during startup

Correctly initialize all values as they are no longer default-initialized

* Cleanup
* CMake cleanups
* Update current year
* Update copyright header
* Use script to return list of all modules
* Update credits, license and ghoul

 * 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

* Initial implementation
* Better approximation of target time
* Correctly use double precision for time passing
* Cleanup
* Adding proportional adjustment of delta time at end of interpolation
* Keyframe based time interpolation
* Add property for time interpolation duration. Move time interpolation methods to TimeManager.
* Fix bugs with time gui
* Make several clicks on delta time buttons work as expected
* Clean up
* Improve time interpolation for parallel connection
* Improve time API. Fix time interpolation bugs.
* Fix mac compile issue
* Add hour button
* Add missing + sign
* Remove newer images from projection buffer when going back in time
* Add comment about clearing projection buffer
* Fix bug with jumping time in parallel connection
* Rename integrateFromTime to previousFrameTime
* Compile fix for iswa module
* Address code review comments
* Code cleanup
* Fix bug causig unsmooth behaviour when pausing while interpolating in time

  * Make height map fallback layer work again
  * Add documentation to joystick button bindings
  * Removed grouped property headers
  * Add new version number constant generated by CMake
  * Make Joystick deadzone work properly
  * Change the startup date on Earth to today
  * Fix key modifier handling
  * Add debugging indices for TreeNodeDebugging
  * Fix script schedule for OsirisRex
  * Do not open Mission schedule automatically
  * Upload default projection texture automatically

  * General code cleanup
  * Fix check_style_guide warnings
  * Remove .clang-format
  * MacOS compile fixes
  * Clang analyzer fixes

 * 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 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

 * 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

* Enable mipmapping for textures where it was previously disabled

* Fix mipmapping for renderable projections

Adapt to changes that absPath is not called automatically as often anymore
Remove atmosphereearth.scene

Correctly layout tooltips in space/time widget
Fall back on old Digital Universe stars
Move settings of tooltip delay into each GuiComponent

More work on coding style

Add strict mode to check_style_guide script

Handle initialize in a separate thread and display rudimentary loading screen

* 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

Replacing void Renderable::render(const RenderData&) with Renderable::render(const RenderData&, RendererTasks&)

- Change Time class to become a non-singleton
- Move ownership of the current time to TimeManager(instead of singleton access).
- Store the Time as a Syncable in TimeManager instead of representing all member variables of Time as Syncables.
- Pass a Time object around in the update/render methods, so that renderables don't have to query the OpenSpaceEngine to know if time is paused or if it jumped.
- Introduce Timeline and Keyframe classes
- Make use of Timelineand Keyframeclasses in KeyframeInteractionMode and TimeManager
- Added basic unit tests for Timelineand Keyframe

Future work: Add interpolation schemes for keyframes. Possibly use keyframes+interpolation feature to tween/morph properties, or figure out if this should be a separate mechanism.

- Remove some power scaled coordaintes.
- Remove spice dependency from sphere geometry.
- Remove dead code.