[common.type_utils] add DSC_has_typedef and DSC_has_static_member
[common.type_utils] add DSC_has_typedef and DSC_has_static_member

These macros can be used to statically check for a typedef or static member
to facilitate the implementation of is_... traits.

renemilk/DUNE-Stuff,renemilk/DUNE-Stuff,renemilk/DUNE-Stuff