Post Jam Bug Fixes.

I fixed the following bugs, the changes will be reflected after the rating period is over.

• Do not enter the Bloodvine Sewers without an escape ring. After reaching floor 6 the dungeon currently breaks. One slot in the enemy table was accidentally left empty, causing the level to not spawn.
• Fully exiting the game will corrupt the save data. I forgot to turn off the code that generates each items id. Each time the game is exited then started the id was being regenerated.
• 40MM Cannon turns into rifle when equipped. Yeah just a silly mistake where the item was pointing to the wrong upgrade.
• Firearm shoots flames instead of bullet. Once more a silly little mistake with dragging and dropping.