Alchemy Tables, improvements to Snowy Peaks, Balances, new visual effects

- Made 'Zap' slightly stronger. - Some balancing to 'Snowy Peaks'. - Added enemy: 'Ice Wraith'. - Added 'Dragon's Breath' as starting skill for Trickster. - Change the 'Breach and Disrupt' mission in Snowy Peaks. - Added 'Alchemy Table' spawns. - Added 'Alchemy Table' powerup. - Optimized sprite rendering. - Some visual improvements and effects. - Added scale to 'Fire Shield', 'Freezing Aura' and 'Spike Ball'. - Changed 'Trickster' skills - replaced Animal Domination with Wasps + added 'Random' skill. - Increased chance of 'Mimic' spawn on all stages. - Nerfed 'Balls of Steel' max level. - Rework the 'King Seal' boss. - Increased 'Bubbles' stun time. - Made some Heroes easier to unlock. - Made some Lave River monsters stronger.