endian: expand encdec functions to make them more dox-friendly
endian: expand encdec functions to make them more dox-friendly

rabbitt/libusual,ifduyue/libusual,markokr/libusual,rabbitt/libusual,ifduyue/libusual,mgjv/libusual,rabbitt/libusual,mgjv/libusual,rabbitt/libusual,ifduyue/libusual,mgjv/libusual,mgjv/libusual,markokr/libusual,ifduyue/libusual,markokr/libusual,markokr/libusual