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/*

Tools/RemoteConsole/ly_remote_console/tests/CMakeLists.txt

@@ -30,6 +30,5 @@ if(PAL_TRAIT_BUILD_HOST_TOOLS AND PAL_TRAIT_BUILD_TESTS_SUPPORTED AND AutomatedT
 #            AssetProcessor
 #            AutomatedTesting.GameLauncher
 #            AutomatedTesting.Assets
-#            Legacy::CryRenderNULL
 #    )
 endif()