* .reuse/dep5: Initial release.
* .gitignore: Renamed "conf.mk" into "conf.mak"
* common.mk: Renamed into "common.mak", added DJGPP environment detection.
* Makefile:
  + Renamed "common.mk" into "common.mak" and "conf.mk" into "conf.mak".
  + Replaced "$(shell realpath ...)" functions with $(realpath ...).
* README.md: Updated dates.
* README.md.license: Removed (information is now in ".reuse/dep5").
* VERSION: New version 0.2.2.
* VERSION.license: Removed (information is now in ".reuse/dep5").
* lodepng/Makefile: Updated dates, renamed "common.mk" into "common.mak".
* lodepng/lodepng.c: Updated to 20230410 version.
* lodepng/lodepng.h: Updated to 20230410 version.
* lodepng/lodepng_ver.h: Updated to 20230410 version.
* src/Makefile: Updated dates, renamed "common.mk" into "common.mak".
* src/fontconv.c: Updated dates, new version 0.1.2.
* src/image.c:
  + Updated dates.
  + (image_err_assign): Removed.
  + (image_err_assign_const): Added.
  + (image_err_assign_var): Added.
* src/scrconv.c: Updated dates, new version 0.1.2.