Proper load/save support for Galaxy generator.
Always create new GalaxyGenerator to ensure clear state for new Galaxy.
Allow unexplored systems to become explored in game.
Persist explored state of a system.
Lua support for exploring systems.
Automatically explore system when entering it.
Ensure that cached sectors in FactionsDatabase consider persistent state.
Itty bitty tweak for vs2013 compiler, make two methods protected rather than private.
Attributes for uv coords should be vec4 not vec2
Left these asserts in mistakenly when I refactored it to handle strips and loops which don't need to adhere to being a multiple of 2 vertices.
Merge pull request #3206 from fluffyfreak/fix-3204

Remove invalid asserts
Update Changelog.txt
Merge pull request #3205 from fluffyfreak/fix-3203

Attributes for uv coords should be vec4 not vec2
Update Changelog.txt
Merge pull request #3201 from lwho/system_exploration

System exploration
Update Changelog.txt
auto-commit: translation updates
auto-commit: translation updates
Expression files and instructions for building with Nix