Version 0.15.6 released

Hello everyone !

A new version of Kriegsspiel has been released. It corrects :

• strange black lines from supply cart horses, heavy cavalry horses, general horses to screen center,

• coughing in war room is less frequent,

• some crashes,

• fast clicking on "start mission" do not duplicate troops anymore.

Thanks for your feedbacks, I could not have corrected these bugs without you !