Lenny Maiorani a95d230a3e LibGfx: Commonize functions in P*MLoader class implementations ...

Problem:
- Functions are duplicated in [PBM,PGM,PPM]Loader class
  implementations. They are functionally equivalent. This does not
  follow the DRY (Don't Repeat Yourself) principle.

Solution:
- Factor out the common functions into a separate file.
- Refactor common code to generic functions.
- Change `PPM_DEBUG` macro to be `PORTABLE_IMAGE_LOADER_DEBUG` to work
  with all the supported types. This requires adding the image type to
  the debug log messages for easier debugging.

2020-12-22 09:24:12 +01:00

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