Display non-String-ified types in Outcome

[cmichi]

I return a Vec<Player> from a contract. Player looks like this:

    pub struct Player {
        pub id: AccountId,
        pub name: String,
        pub gas_used: u64,
        pub score: u64,
    }

The UI displays this though:

It would be great to have the actual types reflected there and not their String representation. So e.g. for gas_used and score a Number. It's harder to debug stuff because this displayed representation is not what is actually returned,

[peetzweg]

Resolved in #441.