Log Message:
tex-make4ht{,-doc}: update to 0.4

New features:

- tex4ht.sty is now loaded before the load of the processed TeX file. This enables
  patching commands used before \documentclass.
- new command line option: --build-dir. It moves auxiliary and temporary files
  to a specified directory.
- list packages with no corresponding TeX4ht configuration .4ht file.
- new extension: copy_images. It copies included images to the output directory.

There are also a lot of bug fixes for MathML, HTML, ODT, and JATS post-processing.