WIP: Added tool to display volumes and materials between two points

Simple plugin that list materials and volumes between two points, it can be used like so:

./build.x86_64-centos7-gcc9-opt/bin/run geoPluginRun -input /workspace/Detector/compact/LHCb-no-GDML.xml -plugin find_intersections 0 0 0 1 1 100