Highly untested and may break world

Current release 1.11.2-1.4.0-83

• fix #1210
• add sizes to artifacts
• fix #1165
• Don't push default values to XML
• prevent crash if a planet is removed
• fix a few mistakes
• update version number
• Address #1205
• Add some variation in lunar spawning, liquid oxygen lakes
• terrain gen revamp, added cave planets, they are very slow
• clean some rendering code