Lava Level, Soul Catcher Evolve, and balance changes.

Hey everyone! Hope you're all enjoying Fray Fight! We've got another update for you today! [b]Patch notes[/b] * Spiders no longer try to avoid objects that have no velocity. * Added lava theme and monsters. * Added an evolved form of Soul Catcher. * Increased the Ballista spawn rate. * Barter now gives a 10% discount. * Added knockback to the Ballista bolts. * Ballista Bolts now despawn. * Fixed an issue with Ballista, Odin's Orb, Heimdall's Halitosis, and Spikey ball not tracking damage for the end screen. * Fixed an issue where Odin's Orb, Heimdall's Halitosis, and Spikey ball were not being affected by cooldown reduction. * Reduced the base cooldown rate on Heimdall's Halitosis by 25%.