ilbmtoppm, pcxtoppm, ppmtoilbm, ppmtoleaf, ppmtomitsu, ppmtompeg, ppmtoneo, ppmtopcx: add pages (#11432)

pages/common/pcxtoppm.md

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+# pcxtoppm
+
+> Convert a PCX file to a PPM image.
+> More information: <https://netpbm.sourceforge.net/doc/pcxtoppm.html>.
+
+- Convert a PCX file to a PPM image:
+
+`pcxtoppm {{path/to/file.pcx}} > {{path/to/file.ppm}}`
+
+- Use a predefined standard palette even if the PCX file provides one:
+
+`pcxtoppm -stdpalette {{path/to/file.pcx}} > {{path/to/file.ppm}}`
+
+- Print information on the PCX header to `stdout`:
+
+`pcxtoppm -verbose {{path/to/file.pcx}} > {{path/to/file.ppm}}`