Review VSYS support of smart contracts where tokens can be deposited into

[josephzxy]

Description

Theoretically, VSYS tokens can be deposited into all smart contracts where tokens can be deposited into.
But as the VSYS token is a special built-in token in the VSYS net, lots of properties like unit cannot be queried like other custom token contracts.
Some logics should be implemented to check the token id against the hardcoded VSYS token ids and handle VSYS tokens separately.