CbmQaPie class as a TPie wrapper, which prevents crashes

CbmQaPie class is a TPie wrapper, which fixes the following TPie's problems:

1. When a TPie is read from a file as a part of TCanvas, it crashes at the destructor.
2. When a TPie is created via copy constructor it crashes at the destructor.
3. An empty TPie crashes at Draw()
4. When one clicks on a TPie in the TBrowser, the TBrowser crashes.
5. TBrowser doesn't draw a TPie by a mouse click, it tries to show class members instead.

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• 290925c4 - CbmQaPie class as a TPie wrapper, which prevents crashes

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• f890cb30 - CbmQaPie class as a TPie wrapper, which prevents crashes

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• 18a59bd9 - CbmQaPie class as a TPie wrapper, which prevents crashes

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canceled the automatic merge

enabled an automatic merge when the pipeline for 18a59bd9 succeeds

canceled the automatic merge

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• 09c25a60 - CbmQaPie class as a TPie wrapper, which prevents crashes

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merged