Code cleanup branch (#618)

* 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

modules/globebrowsing/rendering/gpu/gpuheightlayer.h

@@ -28,7 +28,6 @@
 #include <modules/globebrowsing/rendering/gpu/gpulayer.h>
 
 #include <modules/globebrowsing/rendering/gpu/gputiledepthtransform.h>
-#include <openspace/util/gpudata.h>
 #include <string>
 
 namespace ghoul::opengl { class ProgramObject; }
@@ -44,7 +43,6 @@ struct TileIndex;
  */
 class GPUHeightLayer : public GPULayer {
 public:
-
     virtual ~GPUHeightLayer() override = default;
 
     /**