Remove obsolete Stripping dependency

Stripping has been removed from master, so Panoramix cannot depend on it.

N.B. while this MR fixes the Panoramix build on master, there is certainly more cleanup to be done in the examples:

git grep Stripping
PanoramixSys/python/PanoramixSys/Configuration.py:                DstConf().EnableUnpack = ["Reconstruction", "Stripping"]
Vis/GaudiPythonTutorial/python/DVMuonIDMaker_TROpt3.py:# Stripping 17 validation
Vis/GaudiPythonTutorial/python/Ex11_V0.py:appConf = ApplicationMgr(OutputLevel=INFO, AppName='V0_Stripping')
Vis/GaudiPythonTutorial/python/Ex11_V0.py:from StrippingSelections.StrippingV0 import StrippingV0Conf
Vis/GaudiPythonTutorial/python/Ex11_V0.py:from StrippingConf.Configuration import StrippingConf
Vis/GaudiPythonTutorial/python/Ex11_V0.py:from StrippingSelections import StreamV0
Vis/GaudiPythonTutorial/python/Ex11_V0.py:v0 = StrippingV0Conf(Monitor=True)
Vis/GaudiPythonTutorial/python/Ex11_V0.py:strip = StrippingConf()
Vis/GaudiPythonTutorial/python/Ex2_multicore.py:importOptions('$STRIPPINGSELECTIONSROOT/options/StrippingBs2JpsiPhi.py')
Vis/GaudiPythonTutorial/python/Ex2_parallel.py:        from StrippingSelections.StrippingBs2JpsiPhi import sequence as seqBs2JpsiPhi
Vis/GaudiPythonTutorial/python/Ex2_singlecore.py:from StrippingSelections.StrippingBs2JpsiPhi import sequence as seqBs2JpsiPhi
Vis/GaudiPythonTutorial/python/Ex2b_multicore.py:importOptions('$STRIPPINGSELECTIONSROOT/options/StrippingBs2JpsiPhi.py')
Vis/GaudiPythonTutorial/python/Ex2b_parallel.py:        from StrippingSelections.StrippingBs2JpsiPhi import sequence as seqBs2JpsiPhi
Vis/GaudiPythonTutorial/python/Ex2c_multicore.py:importOptions('$STRIPPINGSELECTIONSROOT/options/StrippingBs2JpsiPhi.py')
Vis/GaudiPythonTutorial/python/ExMuonEff.py:from StrippingSelections.StrippingBs2JpsiPhi import sequence as seqBs2JpsiPhi
Vis/GaudiPythonTutorial/python/LHCbConfig.py:DstConf().EnableUnpack = ["Reconstruction", "Stripping"]
Vis/GaudiPythonTutorial/python/LHCbConfigMin.py:DstConf().EnableUnpack = ["Reconstruction", "Stripping"]
Vis/GaudiPythonTutorial/python/ReadLogFiles.py:#fn = 'http://lhcb-logs.cern.ch/storage/lhcb/production/Stripping-DC06/config/0000prodid/LOG/xxxx/000qqqqq/Brunel_0000pro
Vis/GaudiPythonTutorial/python/gaudigadgets.py:                streams.append(tmp.replace('StrippingStream', ''))
Vis/GaudiPythonTutorial/python/gaudigadgets.py:                lines.append(tmp.replace('Stripping', ''))
Vis/GaudiPythonTutorial/python/newDST_v31.opts://--     Configuration = DC06 - Stripping-v31-lumi2
Vis/GaudiPythonTutorial/python/selv19r9.py:from StrippingSelections.StrippingBs2JpsiPhi import StrippingBs2JpsiPhiConf
Vis/GaudiPythonTutorial/python/selv19r9.py:combineP = StrippingBs2JpsiPhiConf().Bs2JpsiPhi()
Vis/Panoramix/examples/Python/findNiceV0.py:container = 'Strip/Phys/StrippingK0S/Particles'
Vis/Panoramix/examples/Python/findNiceV0.py:    aV0 = evt['Strip/Phys/StrippingK0S/Particles'][key]
Vis/Panoramix/examples/Python/minScript.py:DstConf().EnableUnpack = ["Reconstruction", "Stripping"]
Vis/Panoramix/scripts/Python/next_event.py:        if evt['Stripping'] or evt['Turbo']: unpackStripping()
Vis/Panoramix/scripts/Python/next_event.py:def unpackStripping():
Vis/Panoramix/scripts/Python/next_event.py:                    lines.append(tmp.replace('Stripping', ''))```