Better material scan

Users no longer need to manually enter codes. Give a root script scan the Material.

root -l 'src/ScanMaterial.cpp("input_file.xml", "output_file.txt", bins, world_size)'

Analysis/MaterialScan/src/ScanMaterial.cpp

+#include <DD4hep/Detector.h>
+#include <DDRec/MaterialScan.h>
+#include <fstream>
+
+void ScanMaterial(string infile, string outfile="MaterialScanLogs.txt", int bins=100, double world_size=1000){
+    using namespace dd4hep;
+    using namespace dd4hep::rec;
+
+    if(infile.empty()){
+        cout << "Usage: root -l 'ScanMaterial.cpp(\"input_file.xml\", \"output_file.txt\", bins, world_size)' " << endl;
+        return;
+    }
+    
+    Detector& description = Detector::getInstance();
+    description.fromXML(infile.c_str());
+    MaterialScan scan(description);
+
+    std::ofstream clearFile(outfile.c_str(), std::ios::out | std::ios::trunc);
+    clearFile.close();
+    FILE* outFile = freopen(outfile.c_str(), "w", stdout);
+    for(int thetabin=0; thetabin<=bins; thetabin++){
+        double theta = thetabin * M_PI / bins;
+        double z = world_size*cos(theta);
+        double tranverse = world_size*sin(theta);
+        for(int phibin=-bins; phibin<=bins; phibin++){
+            double phi = phibin * M_PI / bins;
+            double x = tranverse*cos(phi);
+            double y = tranverse*sin(phi);
+            scan.print(0,0,0,x,y,z);
+        }
+    }
+    fclose(outFile);
+    return;
+}
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