Avoid mixed use of inline const string and static string as with clang10 results in null value
For whatever reason (compiler bug?) clang10 does not like
inline const std::string Default = LHCb::Det::VP::det_path;
where LHCb::Det::VP::det_path
is a static string, as this results in a NULL value.
This MR converts the statics to inlines to avoid this.
Edited by Christopher Rob Jones