TrackerMiner: ensure AsyncCallData is removed from the list when it's dispatched
TrackerMiner: ensure AsyncCallData is removed from the list when it's dispatched

Aditionally, a couple of memory leaks have been fixed.

hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker