Allow to obtain the current tx

[shargon]

Close #1431

[shargon]

dotnet format is failing without changes...

[superboyiii]

@shargon Will you apply it on devpack-dotnet?

[shargon]

Will you apply it on devpack-dotnet?

Yes, take a look neo-project/neo-devpack-dotnet@060d300

[shargon]

@erikzhang could you merge this, the error is not related to this PR

[erikzhang]

Why not use System.Runtime.GetScriptContainer?

[shargon]

As a developer perspective, we return an Array of stack items, but the developer can't know if it's a block or Transaction, with this method, we always know that it's a Transaction, maybe we should remove the GetScriptContainer

Wwhat is the behaviour of this if it's not a Block?

Block block=(Block)Runtime.GetScriptContainer();

[erikzhang]

If it's a block, it won't call GetScriptContainer.

[shargon]

If it's a block, it won't call GetScriptContainer.

Always is a TX except in ConsensusPayload and Block right? So do you think that it's not needed because with SmartContract always will be a Transaction?

Is not better to create two syscalls and add GetCurrentBlock?

[Tommo-L]

Is not better to create two syscalls and add GetCurrentBlock?

For me, I'd like to see that we can add it, as it'll be more friendly to contract developers.