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/IEditorImpl.cpp

@@ -71,7 +71,6 @@ AZ_POP_DISABLE_WARNING
 #include "BackgroundTaskManager.h"
 #include "BackgroundScheduleManager.h"
 #include "EditorFileMonitor.h"
-#include "Mission.h"
 #include "MainStatusBar.h"
 
 #include "SettingsBlock.h"
@@ -441,15 +440,6 @@ ISystem* CEditorImpl::GetSystem()
     return m_pSystem;
 }
 
-I3DEngine* CEditorImpl::Get3DEngine()
-{
-    if (gEnv)
-    {
-        return gEnv->p3DEngine;
-    }
-    return nullptr;
-}
-
 IRenderer*  CEditorImpl::GetRenderer()
 {
     if (gEnv)
@@ -1716,13 +1706,6 @@ void CEditorImpl::RegisterObjectContextMenuExtension(TContextMenuExtensionFunc f
     m_objectContextMenuExtensions.push_back(func);
 }
 
-void CEditorImpl::SetCurrentMissionTime(float time)
-{
-    if (CMission* pMission = GetIEditor()->GetDocument()->GetCurrentMission())
-    {
-        pMission->SetTime(time);
-    }
-}
 // Vladimir@Conffx
 SSystemGlobalEnvironment* CEditorImpl::GetEnv()
 {