Add some new features

Only need to hover over the text or symbol instead of clicking the help symbol. Requires less clicks and is less intrusive.

Also add a status icon in for Minecraft server status. Shows white for unknown, green for up, yellow for somewhat up and red for down. Uses some icons under a CC licence so the README has been updated according to that licence. I'm not entirely happy with where the checkMojangStatus() call is but as far as I can see, if I wanted to do that check in Settings, I would need to create a field where the LauncherFrame is instanced. Current implementation may break the design philosophy. 

And apparently you can't do 2 different pull requests until your first one has been merged and the fork updated so these have both been rolled into one sorry =( Wanted to keep them separate but got ahead of myself.