Abstract Use of Pointers to Access Data

[dcvz]

It'd be great to abstract the use of pointers to access data. There are some obvious places where pointers are being used:

• run_dl() - the main method takes in a pointer to the start of the draw lists we iterate through
• vertex, matrix commands - w1 points to location in memory where the vertices or matrices can be read
• branch dl command - points to a location in memory where a new display list can be found

One possible way might be to introduce some kind of new Memory trait that implements some methods for grabbing the pointer to the display list and for branches.. as well as reading u8's and u16's for reading vertices and matrices.