feature: support platform by adding `type` by truncating `version`

[coolaj86]

See

• docs: add asset lock special txs dashpay/docs-core#112 (comment)
• https://trpc.digitalcash.dev/#?method=getrawtransaction&params=["50757f651f335e22c5a810bd05c1e5aac0d95b132f6454e2a72683f88e3983f3",true]&submit
• https://github.com/dashpay/dips/blob/master/dip-0002.md

Also:

• https://docs.dash.org/projects/core/en/stable/docs/reference/transactions-special-transactions.html#assetlocktx