Remove more unused things from CryCommon and CrySystem. (#709)

Lots of unrelated removals, I basically tried to remove everything exposed via gEnv that isn't used anymore, and following the threads found a few other things to remove also.

Code/CryEngine/CryCommon/crycommon_files.cmake

@@ -22,7 +22,6 @@ set(FILES
     IConsole.h
     IEntityRenderState.h
     IEntityRenderState_info.cpp
-    IFlares.h
     IFont.h
     IFunctorBase.h
     IFuncVariable.h
@@ -40,12 +39,10 @@ set(FILES
     ILog.h
     ILZ4Decompressor.h
     IMaterial.h
-    IMaterialEffects.h
     IMemory.h
     IMeshBaking.h
     IMiniLog.h
     IMovieSystem.h
-    INotificationNetwork.h
     IPhysics.h
     IPhysicsDebugRenderer.h
     IPostEffectGroup.h
@@ -55,12 +52,10 @@ set(FILES
     IRenderer.h
     IRenderMesh.h
     IResourceCollector.h
-    IResourceCompilerHelper.h
     IResourceManager.h
     ISerialize.h
     IShader.h
     IShader_info.h
-    ISoftCodeMgr.h
     ISplines.h
     IStatObj.h
     StatObjBus.h
@@ -69,11 +64,8 @@ set(FILES
     IStreamEngineDefs.h
     ISurfaceType.h
     ISystem.h
-    ISystemScheduler.h
     ITextModeConsole.h
     ITexture.h
-    IThreadManager.h
-    IThreadTask.h
     ITimer.h
     IValidator.h
     IVideoRenderer.h
@@ -108,7 +100,6 @@ set(FILES
     MaterialUtils.h
     MTPseudoRandom.cpp
     CryTypeInfo.cpp
-    IResourceCompilerHelper.cpp
     BaseTypes.h
     CompileTimeAssert.h
     CryThreadSafeWorkerContainer.h
@@ -170,7 +161,6 @@ set(FILES
     PoolAllocator.h
     primitives.h
     primitives_info.h
-    ProfileLog.h
     ProjectDefines.h
     Range.h
     RenderContextConfig.h