TrigT1MuctpiPhase1: code cleanup

• delete unused BitOp class (was a copy from TrigT1Interfaces)
• avoid heap-allocation where possible
• replace vector<MuonSectorProcessor> with std::array as the number of processors is fixed to 2.
• const fixes
• move private headers to src directory

cc @armbrust

P.S.: There is more work to be done, i.e. to make this code thread-safe.