Euryale's Gambit 1.0.18

Euryale's Gambit 1.0.18 is not a content update. There are some fixes and updates to dialog, but otherwise, this release is just bringing the build system up to date.

• Add title music
  
• Add some sound effects to intro
  
• Minor dialog fixes to intro
  
• Dialog changes to Ash and Igret scene in "End Game"
  
• Fix image intro_bounty_21, intro_meteor_18,19,20,spoons_cabin_5
  
• Add Spanish AI translation.
  
• Use AV1 encoding for video files (better quality/compression)