Module Timing Source Selector UI Improvements

[Beazurt]

I am referring to the list of modules in the Standard Engine Editor Tab that appears when a user selects the 'Use Module Timing Source' option. Currently we show a list of every module in the engine at once. This could be replaced by a combo box selector of some sort to take up less space and look cleaner. The display also shows the name of the configuration class instead of using the name of the module that was chosen in the editor.