Fixed a bug in the railgun tool. TunnelAction now cancels the activate event if it end up destroying no blocks. I also increased its priority to HIGH so that PlaySoundAction is lower than it. The result is that an explosion sound will only play if the railgun actually destroys blocks
Pressing right arrow key in chat while in debug mode no longer fast-forwards time
Merge #468 from @sdab - railgun tweaks
Update credits and some misc