Pilot beampipe with AlBe composition. HGCal thermal screen at the bottom.
Include HGCal support.
Merged hgc-v5-geometry-modifications2 from repository vandreev11
Correct thickness of thermal screen and material.
Merged hgc-v5-geometry-modifications3 from repository vandreev11
Cleanup for PR 5935
Merge pull request #5905 from ianna/hgcal-thermal-screen

Hgcal Thermal Screen