v0.51.0

Changelog

fixed shader changes during winter wonderland updates breaking tutorial box masking
fixed mouse left click sprite having pixel bleeding from neighbouring icon on sprite map
fixed power plant buffs being available despite the according building not being unlocked yet
fixed event resource multipliers showing up in the town stats menu even outside the duration of the event
fixed undo inside workshop sometimes not refreshing visual module states in module list
fixed construction firm "instant finish using gems"-price not using selected notation
fixed upgrading a technology inside power plant not properly refreshing max. power