Fix variable argument list handing in |EventRacerLog::internf|
Remove incorrect happens-before edge

An event-action, which installs an event-handler, does not precede the
invocation of the said handler, in fact it may race with it.
Log memory read/write operations related to |getElementById|
Log read/write operations involing DOM timers
Hide some move mouse events in the debug build
Add const versions of |eventTargetData| and |ensureEventTargetData|

This is needed in order to have const |getSerial|.
Log read/write of Element attributes