[Ming-dev] memory tracking

[strk <st...@ke...>]

I've added a garbage collector module for ming.
Provides a call to add a new object to the allocations list
passing object pointer and destructor function pointer and
returning a memory node.
Provides a call to remove a node from the list.
Provides a Ming_collectGarbage() call to go throug the
list and destroy all linked objects.

Every Ming object module should include registration/removal
of allocs if the compile time option TRACK_ALLOCS is defined
and evaluates to something != 0.

You can see an example in movie.c.
Note that the list node pointer is embedded in the movie structure,
so to be fast in link/unlink operations.

If you do not call Ming_collectGarbage() everything
is like before, except for bigger memory consumpion (6 bytes for
each ming object in memory).
If you don't define TRACK_ALLOCS everything will be *exactly* as
before, and calls to Ming_collectGarbage will do nothing.

I'd remove mem.c and mem.h for the sake of simplicity,
they have a too general approach, which is not even working...
Anyone against this ?

--strk;