UI Options hotfix + melee improvements

• We fixed the UI so now options such as Music and Volume works correctly, and values get saved/restored properly as well.
• Improved everything melee, so now you cannot longer kill players behind a wall.
• New melee attack in PvP modes. Basically, when you are next to a player, if you press attack again, you'll cut your enemy with a brand new machete. Á la Metal Slug!
• Improved SFX sounds for landing.

Here's our previous game fixes, in case you missed our latest video: