* eliminate some more transmute()
* Address `review comments`
* Make unsafe block smaller
* Use different byte-order than `std`, read words as big endian instead
of little endian!
* Fix IpAddresses nits
* Use `from_be` to work both for big and little endian
* Ipv6 addresses were incorrectly `transmuted`
* remove needless lifetime annotation
* Update `add_license` script
* run script
* add `remove duplicate lines script` and run it
* Revert changes `English spaces`
* strip whitespaces
* Revert `GPL` in files with `apache/mit license`
* don't append `gpl license` in files with other lic
* Don't append `gpl header` in files with other lic.
* re-ran script
* include c and cpp files too
* remove duplicate header
* rebase nit
