0.2.1808.13 Workshop publishing fixed

This is a specific bug fix update. Feature development has been going on in the area of fleet editing and persistency, but those are not ready for release yet. Apparently publishing ship blueprints to the workshop has been unreliable / broken for some time now, but since there hasn't been any direct complaints I haven't thought much of it. Fixing the issues required migrating to use a different Steam API wrapper for C# and a quite serious investigation to find a really tricky bug, but the integration should now work reliably. The publishing is now truly asynchronous as well, so the game doesn't lock up while uploading.