Added some image size optimization:
- "jpeq_quality_level" allows to specify global quality level for all operations on JPEGs. This value is an integer - percentage points in a range from 40 to 100. Previously it was hardcoded to 75% and this will continue to be its default value for backward compatibility. This setting affects every write operation on JPEG which is performed.
- In addition new "optimize_images" could be set to "true" forcing reencoding of all PNG images with best available compression level and JPEG images only if requested quality level specified by "jpeq_quality_level" is lower than detected quality level of image already in a book.
Full Changelog: v1.72.3...v1.73.0