List pools

Static lists are cool, but they are very limited expressiveness wise because they must be known at compile time

Pools fix this by having a pool of static lists that the user code can allocate at any time

PooledList a = allocate();

But because the pool is limited, the pooled list must be freed when not needed, the garbage collector will not handle it(yet)

a.free();

Other than that, the PooledList behaves just like a List and can do almost anything a List does