add events for Windows APC, NtContinue, callback, and cbret

From [email protected] on December 11, 2009 21:39:16

This was PR 200410

NtContinue and NtCallbackReturn can be watched for via the syscall events, and int 0x2b via the bb event. The Ki entries can be monitored via the bb event as well. So this would be a purely convenience set of events. The callback start and stop events can be important when keeping thread-shared state, because often some part of the state should be shared across callbacks while other parts should be separated.

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=241