Update 3 - More small tweaks and bug fixes

Third batch of small updates landed. Here's a short summary:

• Planet can be rotated by the mouse wheel.
• Revamp victory page. We don't just break the game and move to "the end" screen, instead a banner is displayed, hiding game stats, and the player can click a button on the banner to actually finish.
• Game size is now smaller.
• Settings are now persisted.
• Some visual tweaks. The planet has an outline now, for example.
• Many bug fixes.

I'm still working on a possible complete re-balancing of everything that might even result in new/changed buildings. The ideas are more concrete now, but no code has been written. Not sure if I'll actually get to do this, but I do hope to leave the game in a more finished state, cutting the more boring parts.