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/BaseObject.h

@@ -35,7 +35,6 @@ class CUndoBaseObject;
 class CObjectManager;
 class CGizmo;
 class CObjectArchive;
-class CEdGeometry;
 struct SSubObjSelectionModifyContext;
 struct SRayHitInfo;
 class ISubObjectSelectionReferenceFrameCalculator;
@@ -580,10 +579,6 @@ public:
     virtual void ModifySubObjSelection([[maybe_unused]] SSubObjSelectionModifyContext& modCtx) {};
     virtual void AcceptSubObjectModify() {};
 
-    // Request a geometry pointer from the object.
-    // Return NULL if geometry can not be retrieved or object does not support geometries.
-    virtual CEdGeometry* GetGeometry() { return 0; };
-
     //! In This function variables of the object must be initialized.
     virtual void InitVariables() {};