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/LyTestTools/tests/CMakeLists.txt

@@ -32,7 +32,6 @@ if(PAL_TRAIT_BUILD_HOST_TOOLS AND PAL_TRAIT_BUILD_TESTS_SUPPORTED AND AutomatedT
             AssetProcessor
             AutomatedTesting.GameLauncher
             AutomatedTesting.Assets
-            Legacy::CryRenderNULL
             COMPONENT TestTools
     )
 
@@ -55,7 +54,6 @@ if(PAL_TRAIT_BUILD_HOST_TOOLS AND PAL_TRAIT_BUILD_TESTS_SUPPORTED AND AutomatedT
             AssetProcessor
             AutomatedTesting.GameLauncher
             AutomatedTesting.Assets
-            Legacy::CryRenderNULL
             COMPONENT TestTools
     )
 endif()