Services should get colors in the logviewer

[Fred Leeflang]

There are many more services than available colors obviously and most services in the logviewer could simply have the default color. However, it would be nice to have the ability to make some select services 'stand out' a little bit more. This could be a configurable option in the menu, but perhaps it's even clever to let vuurmuur_conf decide on changing the color automatically for example when there's an unusual amount of a specific traffic

[Victor Julien]

The number of colors to pick from is limited indeed. I believe there is some way to make ncurses show more colors, maybe it's worth to investigate that.

I like the suggestion here, although I wonder if it wouldn't make more sense to assign the colors to rules instead of services.