Bugfix patch 0.4.1

I hope everyone is having a good time with the new tech-tree system! We have a smaller patch to fix some issues with 0.4.0. We will now be starting on the autonomous transport system which I can't wait to get into the game! I really think it will take ITC to the next level. Patch notes for today's patch below: December 27, 2018 v0.4.1 PATCH NOTES: -Medicine will now be given priority over other cargoes of same slot when its price is higher. -New Cochin ships now have exhaust trails. -Passenger icons are now white and much more visible in planet window. -Added a few new tutorial popups -Lowered brightness of class M4 planets -Fixed problems with Cert research for B3, C4, WC2 -Pressing esc now properly unpauses the game when exiting the menu. -research station text and tooltips corrected. -Fixed a game crash having to do with Robotics production on Mars. -Fixed a bug causing subsidizing industries to not always take your money. -Fixed bug causing AI to not go bankrupt sometimes. -Pickup next demand for machinery and robotics will now always work correctly. -Increased max system scroll radius. -Fixed machinery prices on Mars. -Ship hover details no longer will stay visible when a ship has warped out of the system.