update 18

fixed xpbooster not upgrading edge towers made volcano sfx quieter fixed shapeshifter tooltip size fixed triggering nerd achievement fixed arrows appearing when they shouldn't added description of tier level fixed flamethrower and pesticide range fixed compare to work when you have a selected tower

flamethrower lvl 1: 0.5dmg -> 0.3dmg lvl 2: 0.9dmg -> 0.5dmg lvl 3: 1.5dmg -> 0.7dmg

pesticide lvl 1: 1dmg -> 0.5dmg lvl 2: 2dmg -> 0.9dmg lvl 3: 2.5dmg -> 1.5dmg