Added exception out parameter to API object callbacks, removed semi-bogus
        JSContext(.*)Exception functions.
        
        To make these calls syntactically simple, I added an exceptionSlot()
        method to the ExecState class, which provides a JSValue** slot in which to 
        store a JSValue* exception.

        * API/APICast.h:
        (toRef):
        * API/JSCallbackConstructor.cpp:
        (KJS::JSCallbackConstructor::construct):
        * API/JSCallbackFunction.cpp:
        (KJS::JSCallbackFunction::callAsFunction):
        * API/JSCallbackObject.cpp:
        (KJS::JSCallbackObject::init):
        (KJS::JSCallbackObject::getOwnPropertySlot):
        (KJS::JSCallbackObject::put):
        (KJS::JSCallbackObject::deleteProperty):
        (KJS::JSCallbackObject::construct):
        (KJS::JSCallbackObject::callAsFunction):
        (KJS::JSCallbackObject::getPropertyList):
        (KJS::JSCallbackObject::toBoolean):
        (KJS::JSCallbackObject::toNumber):
        (KJS::JSCallbackObject::toString):
        (KJS::JSCallbackObject::staticValueGetter):
        (KJS::JSCallbackObject::callbackGetter):
        * API/JSContextRef.cpp:
        (JSCheckSyntax):
        * API/JSContextRef.h:
        * API/JSNode.c:
        (JSNodePrototype_appendChild):
        (JSNodePrototype_removeChild):
        (JSNodePrototype_replaceChild):
        (JSNode_getNodeType):
        (JSNode_getChildNodes):
        (JSNode_getFirstChild):
        (JSNode_construct):
        * API/JSNode.h:
        * API/JSNodeList.c:
        (JSNodeListPrototype_item):
        (JSNodeList_length):
        (JSNodeList_getProperty):
        * API/JSObjectRef.h:
        * API/minidom.c:
        (print):
        * API/testapi.c:
        (MyObject_initialize):
        (MyObject_hasProperty):
        (MyObject_getProperty):
        (MyObject_setProperty):
        (MyObject_deleteProperty):
        (MyObject_getPropertyList):
        (MyObject_callAsFunction):
        (MyObject_callAsConstructor):
        (MyObject_convertToType):
        (print_callAsFunction):
        (myConstructor_callAsConstructor):
        (main):
        * JavaScriptCore.exp:
        * kjs/ExecState.h:
        (KJS::ExecState::exceptionHandle):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15317 268f45cc-cd09-0410-ab3c-d52691b4dbfc