LUCID: cmake cleanup

• remove atlas_depends_on_subdirs
• update library and external dependencies
• enable flake8 where relevant

ForwardDetectors/LUCID/LUCID_Cnv/LUCID_EventAthenaPool/CMakeLists.txt

-################################################################################
-# Package: LUCID_EventAthenaPool
-################################################################################
+# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( LUCID_EventAthenaPool )
 
-# Declare the package's dependencies:
-atlas_depends_on_subdirs( PRIVATE
-                          Database/AthenaPOOL/AthenaPoolCnvSvc
-                          Database/AthenaPOOL/AthenaPoolUtilities
-                          ForwardDetectors/LUCID/LUCID_Cnv/LUCID_EventTPCnv
-                          ForwardDetectors/LUCID/LUCID_RawEvent
-                          ForwardDetectors/LUCID/LUCID_SimUtils/LUCID_SimEvent
-                          GaudiKernel )
-
 # Component(s) in the package:
 atlas_add_poolcnv_library( LUCID_EventAthenaPoolPoolCnv
                            src/*.cxx
                            FILES LUCID_SimEvent/LUCID_SimHitCollection.h LUCID_RawEvent/LUCID_DigitContainer.h LUCID_RawEvent/LUCID_RawDataContainer.h
-                           LINK_LIBRARIES AthenaPoolCnvSvcLib AthenaPoolUtilities LUCID_EventTPCnv LUCID_RawEvent LUCID_SimEvent GaudiKernel )
+                           LINK_LIBRARIES AthenaPoolCnvSvcLib LUCID_EventTPCnv LUCID_RawEvent GaudiKernel )