Reviewed by Darin.  Patch by James G. Speth.

        - http://bugzilla.opendarwin.org/show_bug.cgi?id=8843
          add a way to build Objective-C test cases in HTML

        Tests running in DumpRenderTree can choose to relax some restrictions of the JavaScript/Objective-C bridge
        allowing more extensive testing of the Obj-C API.  (and by more extensive, I mean this lets scripts do 
        pretty much whatever they want, including acting as delegates, generating events, instantiating obj-c
        objects, etc... )

        * DumpRenderTree/ObjCPlugin.h:
        * DumpRenderTree/ObjCPlugin.m: this ability is only exposed to scripts running in DumpRenderTree
        (+[ObjCPlugin isSelectorExcludedFromWebScript:]):
        (+[ObjCPlugin webScriptNameForSelector:]):
        (-[ObjCPlugin removeBridgeRestrictions:]): scripts call this to open up obj-c for extensive testing
        (+[NSObject setAllowsScriptsFullAccess:]): makes NSObject allow all selectors to be invoked from script
        (+[NSObject allowsScriptsFullAccess]):
        (+[NSObject isSelectorExcludedFromWebScript:]): when full access is enabled, no selector is excluded
        (+[NSObject webScriptNameForSelector:]): always return nil for the default selector mutation
        (-[JSObjC classNameOfObject:isSelectorExcludedFromWebScript:]):
        (+[JSObjC webScriptNameForSelector:]):
        (-[JSObjC invokeDefaultMethodWithArguments:]): shortcut for accessing classes
        (-[JSObjC lookUpClass:]): allow scripts to retrieve obj-c classes by name
        (-[JSObjC log:]): access to NSLog function
        (-[JSObjC retainObject:]): useful obj-c functions that are otherwise hard to reach from javascript
        (-[JSObjC classOfObject:]):
        (-[JSObjC classNameOfObject:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15020 268f45cc-cd09-0410-ab3c-d52691b4dbfc