Changes to Matrix2, Matrix3, Matrix4

[ghost]

I added this[int column, int row] to all the matrix classes. I found it useful in Matrix4, and I use it in my code.

[ghost]

I updated it with your proposed changes. I had to add this[int] to Vector4, as it did not have one.

[giawa]

Since Vector uses the Get method, perhaps it is worth modifying this code so that matrices also use Get. What do you both think? Also, agreed on the comment from TheAIBot about putting the Exception under the else case.

[ghost]

Since Vector uses the Get method, perhaps it is worth modifying this code so that matrices also use Get. What do you both think? Also, agreed on the comment from TheAIBot about putting the Exception under the else case.

Yeah, I will update the pull request with the changes.

[giawa]

Get has been added to Vector2 as part of a recent PR. I suggest merging the dotnetcore branch back into your branch and then continuing from there. Thanks!

[ghost]

I made a mistake, and I have to redo this pull request.