rem: WMSetRulerReleaseAction(WMRuler *rPtr, WMAction *action, void *clientData)
add: void WMSetRulerReleaseAction(WMRuler * rPtr, WMAction * action, void *clientData)
context: WMSetRulerReleaseAction(WMRuler *rPtr, WMAction *action, void *clientData){    if(!rPtr)        return;    rPtr->releaseAction = action;    rPtr->clientData = clientData;}