Modernize LoKiCore

• prefer switch over if-elseif-elseif-elseif-else
• prefer auto
• prefer implicit destructor
• prefer direct member initialization
• prefer STL algorithms over raw loops
• remove obsolete SVN/CVS keywords
• prefer SmartIF over plain svc pointer and explicit release
• prefer std::integral_constant over enum with single value
• prefer '\n' over std::endl when there is no reason to 'flush'
• remove conditional code for boost version < 1.56
• prefer lambda as predicate
• prefer emplace_back over push_back
• consolidate several XYZSvc implementations into single templated svc method