icon improvements

So I'm liking lots of the new icons; there's a few I'm less keen on though

• the new camel XML file icon is illegible. How about we reuse the same Camel icon used for browsing (or try another?)
• Routes folder icon (when browsing Camel contexts in JMX / Fabric) now looks a bit out of place with other icons looking neater around it; wonder if we can use the Route icon and put it inside a Folder icon like we've done for Fabrics / Clouds / Containers etc?
• don't like the F for Fabric; Just looks a big ugly - could we try something else? I'd prefer even the old f-fusesource icon we used to use for Camel XML