fix(sc): default contract output is ff00 (#269)
fix(sc): default contract output is ff00 (#269)

Return code for Void (ff) is not passed as `ff`, but as `ff00`, because it is its biginteger representation (see: https://github.com/neo-project/neo/pull/253). For regular types <= 16, it continues the same, a single hex, because it is the same as bigint representation.
snowypowers/neon-js,snowypowers/neon-js,snowypowers/neon-js,snowypowers/neon-js,snowypowers/neon-js