Changing long longs in EventInfo into std::int64_t

Merged Marcin Jerzy Nowak requested to merge mnowak/athena:longlong into master

Better to use types with "known" fixed bitsize - and long long may jump to 128 bits at some point.

Modified also 'MissingETBase::Types::bitmask_t' because it was used I/O

Had to update the TBranchAuxDynReader to handle the int type changes correctly and fixed calls to GetConversionStreamerInfo in TAuxStore

Edited by Marcin Jerzy Nowak

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