Fix Array2D 2 dimensional access bug

[Barsonax]

Summary

There is no check if the provided x is valid on the 2 dimensional indexer.

Also add unit tests for this.

How to reproduce [Bugs]

• Define a 2x2 array
• Access the array with x = 2 and y = 0.
• This will cause the actual coordinates to turn into x = 0 and y = 1.

[Barsonax]

Fixed on develop