Convert current structure to class based approach.

[Xaymar]

While the current approach is simple to use, it is not very flexible and requires reinitialization every time it is used. A better approach would be to convert it into a class based approach, allowing the distributor to be reused multiple times.

Some things need to be taken into account for this:

• What will affect memory storage or trigger reallocation of resources?
• When should we allocate resources? Immediately or only when distributing?
• Should the RandomStream be reset or kept like it is? Maybe a seperate function to reset it?