[FOCAL-66] ECAL geoemetry and step manager for pads

[amatyja]

[FOCAL-66] ECAL geometry and step manager for pads

[github-actions[bot]]

REQUEST FOR PRODUCTION RELEASES: To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available async-2023-pbpb-apass3 async-2023-pbpb-apass4 async-2023-pp-apass4 async-2024-pp-apass1 async-2022-pp-apass7 async-2024-pp-cpass0

[alibuild]

Error while checking build/O2/fullCI for 547b62e90dd682eb2d7d3548a63a12afc004fbfc at 2024-07-04 09:30:

## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
/sw/SOURCES/O2/13249-slc8_x86-64/0/Detectors/FOCAL/simulation/src/Detector.cxx:980:33: error: use nullptr [modernize-use-nullptr]
++ [[ 0 == 0 ]]
++ exit 1
--

Full log here.

[amatyja]

I've added missing string method c_srt() to logs.