WIMLIB_COMPRESSION_TYPE_LZX is now 2 (so it's the same as
WIMGAPI).
+ - Progress functions, including their prototypes as well as how
+ they are provided to the library, have been changed.
+
- 'struct wimlib_capture_config' has been removed. The library
now takes the path to the configuration file directly. This
affects wimlib_add_image(), wimlib_add_image_multisource(),