chapter297, [SORA][SORA Network] Goodbye to the IMPLEMENT_SERIALIZE

We completed the confirm that is no problem even if the latest core serialization “ADD_SERIALIZE_METHODS” is implemented in this core.

Therefore, we ported from IMPLEMENT_SERIALIZE to ADD_SERIALIZE_METHODS.

SorachanCoin: eliminated IMPLEMENT_SERIALIZE(old core):
https://github.com/FromHDDtoSSD/SorachanCoin-qt/commit/77b23c779a8e8376d6883b181e4368fd2467c628