v0.9.0 - Lights

Features

• ESC can now be used in game to call up the menu screen.
• Generation and lifeform counter now appear on pause screen.
• Tests added for universe state. This loads up test save files runs unit tests and checks several generations have the expected life count. (This unfortunately then broke in Bevy 0.12 and has not been repaired)
• Lighting effects added from local star
• Ship now has two forward facing flood lights
• Meshes, icon and font assets are now embedded into the binary.

Fixes / Optimizations

• As a result of the tests, a dozen or so life rules have been added or corrected!
• System sets corrected to remove code that checks states within systems.

Chores

• Now using Bevy 0.13. Refactored code to support required changes.