trace: rework alloc tracing
Remove trace, we use debug log for that Make alloc trace simpler, removing some methods. Activate alloc trace with a GST_TRACE=3 environment variable. Dump leaked objects atexit. Provide an offset in the object where the GType can be found so that more verbose info can be given for objects. Remove -T option from gst-launch because tracing is now triggered with the environment variable.
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