Use class instead of direct element color override for nav icon state

[chron0]

Currently the icon gets a direct element color override of color: rgb(0, 255, 0);
That interferes with other themes efforts to keep a consistent color matching scheme.

Could we use an "active" class, which can be overridden by themes?

[kantlivelong]

I've committed this to a new branch. Would anyone be willing to give it a test?

[chron0]

Sure, if no one else beats me to it, I'll try it the coming weekend. And if it works, I'll also directly build the css updates into DarkMatter Theme, so it'll work with it straight away.

[kantlivelong]

I tested this with a modified TouchUI (PR pending) and it looks good here. Will merge into devel soon.

[kantlivelong]

Tested again with modified Cyborg theme. Merged into devel.