Changes:

Added scrap system:

• Enemy ships now drop scrap
• Scrap can be collected and used to buy upgrades

Added systems menu:

• You can now press E to bring up the systems menu
• In the systems menu, you can choose different systems to upgrade
• For each system you can use scrap to upgrade parts of your ship

Added debug mode:

• You can now press F3 to bring up a debug mode
• In debug mode you can see stats, chunk borders and AI markers