Dead End v7.0

What's Changed

• removed duplicate code + decreasing future edits in menus by @amastis in #44
• clean up a function by @amastis in #45
• Improved Chapter creation + further development by @amastis in #46
• updated grabbing chapter info from save file by @amastis in #47
• chapter check before accessing checkpoints by @amastis in #48
• fixed bug by @amastis in #49
• minor fixes by @crazyguy42781 in #50
• Update chapter2.py by @amastis in #51
• minor fix for main menu by @crazyguy42781 in #52
• making bad ending universal across chapters by @amastis in #54
• Refactor code - horde mode by @amastis in #55
• Refactor wave reward by @amastis in #56
• Update horde unlock after chapter played by @amastis in #57
• Update game.py by @amastis in #58

Full Changelog: v6.0...v7.0