Improved Favorites

Using favorites I noticed my number of favorites became un-usable. I just noted down the spec and type them in every time. Since then I haven't used favorites at all compared to constantly when they were just 10 or so relevant to the map I was currently working on.

It would be nice to have just the favorites for the style of map I am working on as a subset of all my favorites. Perhaps select them when creating a new map similar to the art manager.

Alternatively provide a simple way to clear all quickly so I can create new ones for just the current map I am working on.