copy_event_alts.py _may_ mistakenly be identifying images used in Chiaki's
tandem epilogue as pose images and discarding them as unused.

This commits starts the SPNatI Valentine's Event

Cupid Meia Starting Lines

See merge request spnati/spnati.gitlab.io!1340

Jura Female Epilogue, Male Epilogue Updates

See merge request spnati/spnati.gitlab.io!1336

These scripts work around the CE's automatic angle-bracket escaping.

 - Made legs slightly thicker
 - Increased overall model height
 - Increased penis size slightly
 - Adjusted stage 6/8 poses so Chihiro isn't constantly erect throughout
 - Fixed layering issues with finished-stage splatter