Replace for_each_mut (internal iteration) with iter_mut (external iteration) in the AMT

[Stebalien]

The iterator will have to yield a smart pointer that:

1. Can be dereferenced immutably with no affect.
2. Can be dereferenced mutably, marking the value as changed.
3. Can be deleted (e.g., by calling some form of ptr.delete() method). This method should consume the smart pointer (possibly returning the inner value).

This will get rid of the last "internal" iteration feature.

[PhantomOz]

can i work on this?

[Stebalien]

Absolutely! Take a look at how we currently use it here.

[rjan90]

Hey @PhantomOz! Are you still interested in working on this, or should I unassign you?

[rjan90]

Unassigning since I have not hear back yet.

[PhantomOz]

I apologize didn't notice that i was assigned till now, Please reassign so that I can work on it @rjan90

[rjan90]

No worries! Reassigned to you now 👍

[rjan90]

Hey @PhantomOz! Do you need some additional guidance on this issue ticket? How is the progress on going on this?

[PhantomOz]

@rjan90 Yes I do