Update 0.3.1

-Leviathan freak-out health ratio changed from 50% to 40%.
-Leviathan fire rate changed from 0.28 to 0.25.
-Leviathans do 50% more damage to the driller if they escape.
-Laser Gate volt wave and vortex bomb artifact mod damage has been reduced.
-Laser Gate overload damage will scale with overload value (fix for Medic Hub exploit).
-Laser Gate health bar moved up a bit.
-Creeps sent back by Chrono Ray have a clock icon, showing they have travelled through time.
-Chrono Ray duration now factors in fire rate.
-Chrono Ray loot stats changed from “duration / fire rate” to “range / distance”.
-Splitter group sized reduced from 5 to 4.
-Splitters have a 50% chance to only spawn 1 child if overpopulated.
-Better multi-click selection code, especially for Laser Gate.
-Some text updates.