0.3.1 Level Update Fixes

Bug fixes:

• Fixed Rotten Woods playability
• Fixed tower range when playing multiple levels
• Fixed tower issues when reselling it
• Fixed obstacle in levels display
• Fixed tower aiming issues (like aiming a near-death enemy or not shooting an enemy)
• Fixed tower instant projectile spawn on purchase or upgrade
• Fixed Roots Stump (and other roots like tower) to spawn multiple roots at the same spot
• Miscellaneous buffs and nerfs on enemies, levels and towers