Pnd gem

Added PndGem2D demostrator detector.

It is added to the mcbm setup in the CbmTransport.
Added enumaterators to CbmDefs.
Added media to media.geo file.
Added TList include to CbmStsHitProducerIdealAlgo.

data/CbmDefs.h

@@ -34,6 +34,7 @@ enum ECbmModuleId {
   kShield,      ///< Beam pipe shielding in MUCH section
   kPlatform,    ///< RICH rail platform
   kCave,        ///< Cave
+  kPndGEM,
   kLastModule   ///< For loops over all modules
 };
 
@@ -51,7 +52,7 @@ enum ECbmDataType {
   kPsdPoint, kPsdDigi,                                   // PSD
   kGlobalTrack,                                          // Global
   kT0Point, kT0Digi, kT0CalDigi, kT0Hit,                 // T0
-	kMuchPoint, kMuchCluster, kTrdPoint
+	kMuchPoint, kMuchCluster, kTrdPoint, kGemDigi, kGemHit
 };