title: Is there a resource for all of the custom GUI styles that come with Unity?
body: <p>Looking in some other Editor Window scripts I see GUI Styles like <code>"OL Title"</code> and <code>"OL Minus"</code>. I'd like to have a resource that shows all styles that we have access to (and bonus if it describes/shows what they look like). I assume it exists <em>somewhere</em> otherwise how would the developer of those scripts know they exist? I just can't find it anywhere.</p>