v0.5.6 - Audio enhancements, misc fixes

This update makes some significant improvements to audio, especially music, which has been remixed and rearranged.

Audio

• Updated all music tracks with better instrumentation and improved arrangements.
  
• Replaced the footstep and bump sound effects with much better ones.
  
• Sound effects now have more consistent volume with each other and with music.
  
• Shop menu now plays the correct sound effect when attempting to buy an item without enough money.
  

Gameplay

• Fixed being unable to purchase an item that costs exactly as much money as the party has.
  
• Fixed Shield Wall not terminating on user KO.
  
• Improved the cadence of Jay's dialogue and event text.
  
• Fixed one of Jay's lines that was incorrectly marked as tutorial text. This meant that the line was skipped if tutorials were disabled, though this did not impact progression.
  

Interface

• Fixed numeric sliders being overly sensitive to analogue input.
  
• Fixed options menu not handling default volume settings correctly.
  
• Hunt: Removed misleading text from Silver Arrow description.