New upgrades 🚨

- Added energy, a new statistic, used when performing certain actions

- Added a mining beam to ship upgrades, helps collecting more resources

- Added a hyperdrive to ship upgrades, now needed to change solar systems

- Added a heat shield to ship upgrades, the higher its level, the less damage the ship takes from heat

- Added a scanner to the ship upgrades to scan planets, only checks for trading posts and resources for now

- Added shiny icons for those new upgrades

- Celestial objects now have proper graphical variants

- New rare celestial object added : Debris cluster, exploring it is dangerous but rewarding.

- Slightly improved what places spawn what enemies

- Fixed a bug where trading posts were not appearing in some places