- Standardized which functions take a JSContext as an argument. The rule is:
        if you might execute JavaScript, you take a JSContext, otherwise you don't.
        
        The FIXME in JSObjectRef.h requires refactoring some parts of Interpreter,
        but not API changes, so I'm putting it off until later.

        * API/JSCallbackObject.cpp:
        (KJS::JSCallbackObject::JSCallbackObject):
        (KJS::JSCallbackObject::init):
        * API/JSCallbackObject.h:
        * API/JSContextRef.cpp:
        (JSContextCreate):
        * API/JSContextRef.h:
        * API/JSObjectRef.cpp:
        (JSObjectMake):
        (JSPropertyEnumeratorGetNext):
        * API/JSObjectRef.h:
        * API/testapi.c:
        (MyObject_initialize):
        (main):
        * JavaScriptCore.exp:
        * kjs/array_object.cpp:
        (ArrayInstance::setLength):
        (ArrayInstance::pushUndefinedObjectsToEnd):
        * kjs/nodes.cpp:
        (ForInNode::execute):
        *...