4651cad73d
I found the naming of these files awkward, where we prefixed them with `asset_library_` to keep them grouped together, and then a library type name. This resulted in rather un-natural names. Also, there are files like `asset_library_service.cc`, which is in fact not another asset library type, but seems like one with the old convention. Moving these files to an own directory keeps the grouping while allowing more natural sounding names.