isolate structures to internal modules

[William Roberts]

We pass miniat to everything, rather then just the minimum slice of the structure, so you get a lot of this:

void foo(miniat *m) {
    m->foo.bar.baz = 7;
}

foo(m);

Where it should be more like this:

void foo(foo *f) {
    f->bar.baz = 7;
}

foo(&m->foo);

We could start to move internal structures typedefs into these C files rather then the spew of headers (make whitebox testing harder).

[William Roberts]

This reason we wont change this is due to cyclic dependencies. We'll just leave this as is, it creates more of a mess trying to reorg it.