V0.304 - Added leaderboard to galaxy screen

Hi all,

I've added a leaderboard to the galaxy screen. This shows the players who have conquered the most systems.
Points are awarded as follows:

Own Planet = 1pt
Own Album = 3pts
Own Artist = 5pts

Capturing tracks from other players not only increases your score, but decreases theirs.

I intend to make this system more involved during the next development phase. I just wanted to add something simple for the time being.

Enjoy!
Cheers,
Steve.