Remove I3DEngine CryCommon Interface (#567)

Delete:

- I3DEngine
- Missions
- Time of day
- GameEffectsSystem Gem
- ImageProcessing Gem
- SVOGI Gem
- Various other things that don't do anything now that the legacy renderer has been removed.

Code/Sandbox/Editor/Objects/EntityObject.h

@@ -214,8 +214,6 @@ public:
     QString GetLightAnimation() const;
 
     IVariable* GetLightVariable(const char* name) const;
-    IOpticsElementBasePtr GetOpticsElement();
-    void SetOpticsName(const QString& opticsFullName);
 
     void PreInitLightProperty();
     void UpdateLightProperty();
@@ -230,8 +228,6 @@ public:
     void RegisterListener(IEntityObjectListener* pListener);
     void UnregisterListener(IEntityObjectListener* pListener);
 
-    CDLight* GetLightProperty() const;
-
 protected:
     template <typename T>
     void SetEntityProperty(const char* name, T value);