Better singleplayer browser

[ccexplore]

Hmm, you never brought up how this would also affect the terrain(etc.) browser in the level editor, until now.  Having those big buttons for subdirectories there look a little odd on first impression, but I guess I can get used to it?   The breadcrumb bar might actually work best for that browser, though it's possible it may be a less familiar UI control for some people.