Build 1143

Another quick update with several minor bug fixes and tweaks.

• Fixed bug: Fix broken background image in Credits Screen.
  
• Fixed bug #23: Added more background music to credits, end-game, debriefing, shopping, and yearbook.
• Fixed bug: Path rendering on the bottom row of the map was not working near exits.
• Fixed bug: Hover tooltip in overhead map should show teacher start location instead of general region (like Chapel or Womb Room).
• Adjust default volume of sound effects and music down again.
• Slightly randomize the orientation of corpses and blood splatters.
• Add a link to the Handbook on the Help screen.
• More insanity babble.
• Link to Sinasac and Martin's creator pages in Credits

Also, I've started work on over-hauling how saved games work so that they are not so annoying - this will surface in a later build, it's currently behind an option that I'm testing, plus I need to keep options for using Files and Google Drive for people who have already saved their games.