Adding CscRawDataCnv_p4 (move from geo hashes to positional hashes for CSCs)

Hi,

this MR adds a CscRawDataCnv_p4 converter since we moved from using CSC identifier hashes which reflect the geometrical position of the CSCs to the actual index of the identifier in the vector of identifiers (positional hash) in !26610 (merged).

The content of the CscRawData still stays as in version p3, just the meaning of m_hashId changes from geometrical to positional hash.

Adding @mnowak, @jchapman