NEW:
- GitHub #164: adding 2 extra image slots for books.
  When upgrading, all styles will get images 3+4 enabled/visible. As usual, you can change their visibility in the style settings.
- The code for fetching images was rewritten. This finally fixes the issues with OpenLibrary.
- DatabazeKnihSearchEngine & BOL parsers updated for site changes

FIXES:
- on-screen keyboard fixes for Android 15+ Edge2Edge usage