A tool to synchronize objects:
Objects derived from AISyncClient can signal that they are
'ready' or 'not ready' for up to 32 events (using a bitmask)
at a time. Clients that are created at roughly the same time
as other clients, and which return the same 'key' (a virtual
function returning an AISyncKey object) will be grouped together
and receive events (by means of virtual functions being called)
to notify them of all clients being ready or not for one of the
events (the least significant bit)). The other events can be polled.
This new version does away with all the templates and explicitly
remembers what events each client is ready for instead of just
updating a counter of the number of clients. This was necessary
because a client is removed then the server needs to know if it
was ready or not when it has to be able to update those counters.
This time I chose to just run over all stored clients and AND
and OR the per-client-ready-masks because 1) that information
is available now and 2) the lists will normally contain only
one or two clients, so it's fast enough.
The new version also allows for real key comparison (and derived
keys) instead of just using "hash" value that is compared.
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