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/IEditor.h

@@ -85,7 +85,6 @@ namespace WinWidget
 }
 
 struct ISystem;
-struct I3DEngine;
 struct IRenderer;
 struct AABB;
 struct IEventLoopHook;
@@ -137,7 +136,6 @@ enum EEditorNotifyEvent
     eNotify_OnEndLayerExport,          // Sent after a layer have been exported.
     eNotify_OnCloseScene,              // Send when the document is about to close.
     eNotify_OnSceneClosed,             // Send when the document is closed.
-    eNotify_OnMissionChange,           // Send when the current mission changes.
     eNotify_OnBeginLoad,               // Sent when the document is start to load.
     eNotify_OnEndLoad,                 // Sent when the document loading is finished
 
@@ -180,8 +178,6 @@ enum EEditorNotifyEvent
 
     eNotify_OnDisplayRenderUpdate,     // Sent when editor finish terrain texture generation.
 
-    eNotify_OnTimeOfDayChange,         // Time of day parameters where modified.
-
     eNotify_OnDataBaseUpdate,          // DataBase Library was modified.
 
     eNotify_OnLayerImportBegin,         //layer import was started
@@ -241,8 +237,6 @@ struct IDocListener
     virtual void OnLoadDocument() = 0;
     //! Called when document is being closed.
     virtual void OnCloseDocument() = 0;
-    //! Called when mission changes.
-    virtual void OnMissionChange() = 0;
 };
 
 //! Derive from this class if you want to register for getting global editor notifications.
@@ -431,7 +425,6 @@ struct IEditor
     virtual void DeleteThis() = 0;
     //! Access to Editor ISystem interface.
     virtual ISystem* GetSystem() = 0;
-    virtual I3DEngine* Get3DEngine() = 0;
     virtual IRenderer* GetRenderer() = 0;
     //! Access to class factory.
     virtual IEditorClassFactory* GetClassFactory() = 0;
@@ -739,8 +732,6 @@ struct IEditor
     typedef AZStd::function<void(QMenu*, const CBaseObject*)> TContextMenuExtensionFunc;
     virtual void RegisterObjectContextMenuExtension(TContextMenuExtensionFunc func) = 0;
 
-    virtual void SetCurrentMissionTime(float time) = 0;
-
     virtual SSystemGlobalEnvironment* GetEnv() = 0;
     virtual IImageUtil* GetImageUtil() = 0;  // Vladimir@conffx
     virtual SEditorSettings* GetEditorSettings() = 0;