Red code legacy renderer (#383)

- Remove some references to gEnv->pRenderer/GetIEditor()->GetRenderer() that is now always null.
- Restore the debug console to existence.
- Stop building the following in preparation for their removal:

Code/CryEngine/Cry3DEngine/*
Code/CryEngine/RenderDll/*
Code/Tools/CryFXC/*
Code/Tools/HLSLCrossCompiler/*
Code/Tools/HLSLCrossCompilerMETAL/*
Code/Tools/RC/*
Code/Tools/ShaderCacheGen/*
Tools/CrySCompileServer/*

Code/Sandbox/Plugins/EditorCommon/CurveEditor.cpp

@@ -38,7 +38,7 @@ AZ_POP_DISABLE_WARNING
 
 #define NO_BUFFER_OVERRUN PREFAST_SUPPRESS_WARNING(6385 6386)
 #include <ISplines.h>
-#include "../Cry3DEngine/Cry_LegacyPhysUtils.h"
+#include "Cry_LegacyPhysUtils.h"
 
 namespace CurveEditorHelpers
 {