parse Via and add via_branch to protocol_header

[silver0511]

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

yunjieshi seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[lmangani]

@silver0511 perhaps we should arrange a Dev call to discuss this from a technical perspective?

[silver0511]

@silver0511 perhaps we should arrange a Dev call to discuss this from a technical perspective?

@lmangani hi, i have submitted a new pull request( #491 ), and show the videos about the transaction feature, please check and review