Add support for Geant4@11.2

[whokion]

Updates for Geant4 11.2

• Change G4VTouchable to G4TouchableHistory
• Use G4EmParameters::Instance()->SetLPM instead of G4EmModel::SetLPMFlag

Description

This MR updates compatibility of celeritas to the new version of Geant4 11.2

Fixes #1074

[sethrj]

Thanks @whokion ! But these changes need to be guarded with G4VERSION macros (there are examples elsewhere) so that it still works all the way back to Geant4 10.5...

[whokion]

As far as I can see, these updates should be good for 10.5 and later without the version guard.

[sethrj]

I added a somewhat hacky CELERITAS_GEANT4_VERSION version macro via the celeritas_sys_config which doesn't require anything downstream to link against geant4. So this now builds on 11.0 and 11.2.

[sethrj]

I'm still having trouble getting this to work at runtime with geant4 11.2. Trying to setup the photoelectric model gives:

G4LivermorePhotoElectricModel data file </opt/spack/opt/spack/sonoma/geant4-data/11.2.0/6vfum26/share/geant4-data-11.2.0/G4EMLOW8.5/epics2017/phot/pe-cs-82.dat> is not opened!

G4EMLOW8.5 exists but epics2017 doesn't!

Looks like this could be related to geant4 change emutils-V11-00-23??

[amandalund]

Odd, I do see the data in G4EMLOW8.5/epics2017/phot/...

[sethrj]

OK, somehow it looks like EMLOW 6.5 got aliased into my 8.5 directory... weird!