Simplify Neo contract to store id instead of address

[mialbu]

I've updated the Neo contract to use an id instead of an address to store the paid out amount (I call it tea). Also, the message to be signed is now the concatenation of id + total earned amount (previously address + total earned amount).

I haven't worked on invoke part on the golang side here. I can take a look sometime, or maybe @faragos or @a-lesi could take a look at this and integrate it in this PR.

Last but not least, you can check the updated contract code here and I've also updated all integration tests to verify that the update actually works as expected.

@tbocek @gsmachado

[faragos]

@mialbu long time no see 🙂
TBH I'm a little bit out-of-the-loop to exactly do the change. I looked at your change shortly. I see the batchPayout now has 3 parameters. I'm not sure how to get the ownerId. If you want we can do a session on your side. Because I have a new PC and I don't have any tooling anymore.

[tbocek]

Thanks! I'll take a look at it