SC: write code in the conditions?

[bchamagne]

Is your feature request related to a problem?

We might want to write code in the conditions blocks for more flexibility.

Describe the solution you'd like

Here's an example (pseudocode):

condition inherit: [
  uco_transfers: (
  found = false

  for transfer: next.uco_transfers do 
    if transfer.to == "010101" do 
      found = true 
    end
  end

  found
  )
]

This code check that there is at least 1 transfer to "010101".

Additional context

No response

[bchamagne]

done in #903