Missing Pointers and Arrays

[jacoblarkin]

Add following to compiler

1. declare pointers (e.g., int*x;)
2. address operator (e.g., x = &y;)
3. dereference operator (e.g., int z = *x;)
4. declare arrays (e.g., int a[3] = {1, 2, 3};)
5. subscript operator (e.g., b = a[1]; a[2] = c;)
6. pointer arithmetic (e.g., x++; ++x; x + 1;)
7. Array to pointer decay (e.g., assert(a + 2 == a[2]); x = a + 1; z = *a;)