Pulse main menu logo to the beat, add pulsing logo in song menu

[yugecin]

close #163 when merged
I made it pulse at 1Hz when music is paused, which may look a bit weird with the scaling. Adjust if needed.

[Lemmmy]

1Hz should be fine IMO - the menu pulses at 60bpm (1Hz) wehn nothing is playing in osu! too.

[itdelatrisu]

Looks great! Good job with the logic to get the beats -- I'd never thought about doing it this way.

Some comments:

• The parseOnlyTimingPoints() method doesn't need MD5InputStreamWrapper since it's not computing the file's MD5 hash.
• In the song menu in osu!, you can click the logo to start the game (call startGame()). Also, hovering over the logo makes it stop pulsing and scales it to ~140% (can't tell exactly).

[yugecin]

Thanks :)
I removed the MD5 wrapper and made the logo a button. When the logo is expanded, the non-expanded hitbox is still used like in osu!. The scale was indeed 140%

[itdelatrisu]

Thanks! :)