Proposal for consistent naming convention for MC simulation points / hits

[mfasDa]

I propose a consistent naming convention for MC simulation points / hits among detectors. Having consistent naming conventions improves the readability of the code. Since now AliceO2 has its own base class BasicHit I propose to use the name "Hit" as class name for detector hit classes. The name "Point" as class name for detector hit classes is in my opinion too general and might be even confusing as we might have different usages of Point objects in the future.