Support for numeric_limits<>

While the native types are supported by numeric_limits<>, the non-native types are not (at least, as far as I can tell). It would be a really nice addition to the library to have all boost::endian types provide numeric_limits specialisations.

Incidentally, if this is not the correct place to report bugs/feature requests, please let me know and I'll move it to wherever is more appropriate.

Thanks,
Roger

No files or tests are identified in the issue. Start by locating the Boost.Endian non-native type definitions and any existing numeric_limits support, then check how native types are covered. Done means all Boost.Endian non-native types have appropriate numeric_limits specializations and tests verify them.

Written by the indexing model from the issue text.