Allow JavaScriptException to be subclassed

[ghost]

No description provided.

[ghost]

On the subject of exception/error handling - it would be nice to have the managed exception's callstack/stack-trace when javascript exceptions are thrown.

here is one minor update that would debugging a lot:

        public static void ThrowReferenceError(Realm realm, string name)
        {
            var message = name != null ? name + " is not defined" : null;
            throw new JavaScriptException(realm.Intrinsics.ReferenceError, message, new System.Exception("managed exception"));
        }

Now this exception will have an inner exception containing the callstack from within the JINT managed code.

You could even wrap the above change with a

#if DEBUG

if you only wanted that inner managed exception callstack to be available when using a debug assembly.

[lahma]

weird indent

[ghost]

ah - yeah - sorry - I wasn't sure if your project preferred tabs or spaces for indenting - I actually didn't realize visual studio had used spaces - so I just updated it with tabs.

Visual Studio does this weird thing where by default for C# it does whatever your preference is (i.e. for me it is tabs - not spaces) - but if it sees spaces for indenting in the file - it will use that instead of whatever you've set for your preference.

[ghost]

I just realized that my usage of tabs (instead of spaces) made the diff look worse - so I just reverted it back to spaces for indent since, at least in this file, that appears to be the convention.

[lahma]

At the same time I don't see much harm in this and then again I'm not sure if custom exceptions should derive from Jint's exceptions as they "are outside the engine". Many BLC exceptions allows this so there's that. Pinging @sebastienros for confirmation.

[ghost]

@sebastienros - this should fix the bug with extension methods that overload mundane methods

Sorry - I failed to check the name requested matches.

[lahma]

Thank you for your contribution! I did small stylistic tweaks before merging, I hope you don't mind.