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/imgui/include/guiparallelcomponent.h

@@ -25,17 +25,15 @@
 #ifndef __OPENSPACE_MODULE_IMGUI___GUIPARALLELCOMPONENT___H__
 #define __OPENSPACE_MODULE_IMGUI___GUIPARALLELCOMPONENT___H__
 
-#include <modules/imgui/include/guicomponent.h>
 #include <modules/imgui/include/guipropertycomponent.h>
 
-#include <string>
-
 namespace openspace::gui {
 
 class GuiParallelComponent : public GuiPropertyComponent {
 public:
     GuiParallelComponent();
     void render() override;
+
 private:
     void renderDisconnected();
     void renderConnecting();