refactoring parse header and fixing CI

IO/IniFileParser.h

@@ -44,6 +44,8 @@ public:
      bool Parse(std::string iniFile);
 
 private:
+     bool ParseHeader(TiXmlNode* xHeader);
+
      bool ParseGCFMModel(TiXmlElement* xGCFM, TiXmlElement* xMain);
 
      bool ParseKrauszModel(TiXmlElement* xKrausz, TiXmlElement* xMain);

demos/scenario_11_sources/inifile.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 
 <JuPedSim project="JPS-Project" version="0.8" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://xsd.jupedsim.org/0.6/jps_ini_core.xsd">
-
+<header>
   <!-- seed used for initialising random generator -->
   <seed>12542</seed>
   <!-- geometry file -->
@@ -16,7 +16,7 @@
 
   <!-- where to store the logs -->
   <logfile>log.txt</logfile>
-
+</header>
   <!-- traffic information: e.g closed doors or smoked rooms -->
   <traffic_constraints>
     <!-- doors states are: close or open -->