v0.3.0

This release brings some major changes, packed in 135 commits and 69 changed files.

• Switched from bevy 0.18 to 0.19
• Added a Fluxer Community Link to the readme
• Added some finally working spherical terrain using big_space and continuously updating quadtrees for optimisation
• Added gravity that pulls everything to the earth's centre
• bevy_fs was renamed to kestrel because the fs in bevy_fs could mean file system
• Added more locations to the menu
• Migrated UI to bevy_feathers
• Added buildings (experimental)

@Koru helped me fixing my messy Git LFS config on Codeberg. Thanks!

Full Changelog: v0.2.0...v0.3.0

Note that the attached ZIP files could be incomplete, use the instructions from the readme instead.