Issues fixed

Some issues where fixed:
* map didn’t display spaceships
* building add buttons didn’t disappear when building was not available
* resources where not correctly calculated
* cant build reason was missing sometimes
* building queue did not disappear

Up and running

The server is up and running again.
Some performance improvements have been made, so loading should be faster.
If you send a Spaceship to a specific solar system the path will be found correctly, though it might take some time if not all solar systems are already loaded