Bugfix/add game id to hash of game state closes #165

[lisasi]

The signature of a game state needs to contain the gameID, otherwise the signed game state could wrongly be used in a different game.

Description

The hash used for signing is now calculated based on the state AND the gameID. The tests are changed accordingly.

Related Issue

165 Add gameID to hash of game state

Motivation and Context

Without this change, this could be a possible way to cheat in a game.

How Has This Been Tested?

Transformed tests accordingly.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

  Checklist contributor:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

  Checklist reviewer:

• [ ] The code has been peer-reviewed by @YourNameHere