Unify variable types between SC and go code

[vojtechsimetka]

Problem

Right now there is a mishmatch between the size of numbers (and potentially other types) between the go code and smart contracts. For example the cheque values are 256 bits integers on the SC side but only 64 bits on go code.

Task

Go through the go code and make it compliant with the smart contracts.

[mortelli]

This issue was deemed too big to be completed in one go.

As a result, it's going to be implemented through multiple PRs.

The first one, which adds the Uint256 type, is PR #2063.

[mortelli]

This issue was deemed too big to be completed in one go.

As a result, it's going to be implemented through multiple PRs.

The first one, which adds the Uint256 type, is PR #2063.

Part 1 merged.

[mortelli]

Part 2 for implementing this issue has been submitted: PR #2082.

[Eknir]

5-7 working days