* Clean up serde rename and use rename_all = camelCase when possible
* snake_case for pricing
* Use camelcase for engine
* Use camel case for seal
* Use camel case for validator set
* Use camel case for confirmation payload
* Use camel case for consensus status
* Use camel case for nodekind
* Use kebab case for provenance
* Use camel case for pubsub
* Use lowercase and camelcase for trace
* Use camel case for whisper
* rename Ethash as irregular name
* 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
