Modernize MuonDAQ

• remove private methods from IMuonRawBuffer interface (as they cannot be called through the interface anyway!)
• add some const in IMuonRawBuffer interface
• prefer std::array over C-style arrays (to avoid decay into pointers, which loose the information on the size of the array)
• prefer zero initialization of array over .fill(0)
• make operator<< friend, in class scope, instead of in global scope
• make static constants constexpr
• prefer inherited constructors
• prefer switch/case over if-then
• prefer range-based loops
• prefer Gaudi::Property with direct member initialization over declareProperty
• reduce scope of variables as much as possible: only declare variables at the point they can be assigned a value
• prefer .fill(0) for arrays over explicit loops
• use lambda to consolidate repeated code
• simplify a few arithmetic expressions
• prefer STL algorithms over raw loops
• use a scoped guard over explicitly grouped 'set/reset' calls
• prefer std::bitset over arrays of bool