[collections] WeakArrayList

[Gregor Zeitlinger <gr...@zeitlinger.de>]

I recently had a severe memory leak because more listeners were added
to a listener list than removed.
I solved the problem by adding only WeakReferences and compacting the
list in a separate thread. CursorableLinkedList has a similar solution
for cursors - except that the cursors are not cleaned up in a separate
thread (which is better, now that I'm thinking about it).

So what I suggest is a list where the entries are stored in weak
references and auto-cleaned like the cursors in CursorableLinkedList.
No more removeListener - which is silly anyways.

-- 
Gregor Zeitlinger
gregor@zeitlinger.de

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