v0.39 - World Gen Options, LWJGL3

A fairly light update as far as features go, but laying the ground work for next bigger biome update.

When you create a new game, there's now a World Settings popup where you can specify a seed value for the terrain-generation. (Also added "getSeed" debug console command when in-game).

Can choose from 4 different day/night cycle modes (always day, normal, long night, always night).

All versions of game now use LWJGL3 backend. Woo! Took a while to get all the kinks worked out. This fixes some issues with high-DPI screens (especially fullscreen mode being chopped off), and fixes some mouse input issues reported on the forums.

Platform specific versions are now bundled with Java 8 JRE (Azul Zulu) - except for Win32.

And some other bug fixes: 

• Game now saves build progress of base modules that are still under construction. (So no more lost resources, and should fix a few related crash issues).
• Fixing some typos.