Changelog: Health and entity system — Astral Divide Steam update #1764739

This is a big update, that comes with many improvements to the game engine, but not many new features. This is necessary to allow future improvements, like the introduction of mobs. Meanwhile I'm also working on the story, which is not yet part of the game. Gameplay changes Added a health system Implemented death and respawn Added a robot printer in the factory bay The player drops robot parts when dying The player looses health if it falls from too high The gravity beam cannot counterbalance an infinite amount of velocity anymore The player explodes when it dies, pushing away nearby drops and entities UI changes Added a health bar Added customized window borders Changed the color and font of the texts Adjusted spacing in the toolbar Added missing tech tree items and sorted the existing elements Fixed wrong output icon in some recipes (for the saw and the mold) Moved the developer comman...