Pnd gem

Radoslaw Karabowicz requested to merge r.karabowicz/CbmRoot:pnd_gem into master

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.

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