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