Feature/globals (#690)

* 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

include/openspace/interaction/keybindingmanager.h

@@ -39,7 +39,7 @@ namespace openspace::scripting { struct LuaLibrary; }
 
 namespace openspace::interaction {
 
-class KeyBindingManager : public DocumentationGenerator {
+class KeybindingManager : public DocumentationGenerator {
 public:
     BooleanType(IsLocalBind);
     BooleanType(IsSynchronized);
@@ -50,7 +50,7 @@ public:
         std::string documentation;
     };
 
-    KeyBindingManager();
+    KeybindingManager();
 
     void resetKeyBindings();