wesnoth-optipng pass

Overall statistics (only for files with a smaller recompressed size):
  Original size: 3106 KiB on 54 files
 Optimized size: 3087 KiB
   Total saving: 18 KiB = 0% decrease
Re-render E3S4.2/E3S5 story image
Reword Wesnoth version requirement string for 1.12.x
E3S4.1: Fix missing SSF for the previously introduced turn 10 [message]
Version 0.9.12