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% ppm: extremely simple interface for writing to ppm files.
provides an extremely simple interface to write ppm files.

provides:
- rgb_t: a simple type for representing colours as rgb values.
- rgb(): initialises `rgb_t` with values for red, green and blue.
- ppm(): writes to a `FILE` from an array of `rgb_t`.
- rgb_print(): prints an `rgb_t` nicely.

check `example.c` for sample usage.