RAII scheme for TOF online algorithms.

Implemented RAII scheme for cbm::algo::tof::Clusterizer and cbm::algo::tof::Hitfind.

Of interest to @fweig @j.decuveland @v.friese.

Interestingly, the way std::map is used in cbm::algo::tof::Hitfind now requires there to be a default constructor for cbm::algo::tof::Clusterizer, even though we never use it. Probably, the compiler wants it to be there, just in case someone tries to access a map element that hasn't been assigned previously.