More Balancing! — Order Of The Gatekeepers Steam update #1387300

Following the change yesterday where Invisible enemies could be seen from half-distance it became clear it's not the best way to address that specialty. I have reverted that change but now have added more options to detecting invisible enemies. Patch Notes:Invisible enemies can not be targeted by Towers that do not have Truesight. Monocle is now an Active Item, on cast it provides 10 seconds of Truesight. Telescope is now an Active Item, on cast it provides 10 seconds of Truesight. Sharpshooter's Spot is now an Active Item, on cast it provides 10 seconds of Truesight to all nearby Towers. Hopefully these tweaks can make Invis waves feel a bit less cheesy.