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

pages/common/ilbmtoppm.md

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+# ilbmtoppm
+
+> Convert an ILBM file to a PPM image.
+> More information: <https://netpbm.sourceforge.net/doc/ilbmtoppm.html>.
+
+- Convert an ILBM file to a PPM image:
+
+`ilbmtoppm {{path/to/file.ilbm}} > {{path/to/file.ppm}}`
+
+- Use the specified color to "show through" where the image is transparent:
+
+`ilbmtoppm -transparent {{color}} {{path/to/file.ilbm}} > {{path/to/file.ppm}}`
+
+- Ignore the chunk with the specified chunk ID:
+
+`ilbmtoppm -ignore {{chunkID}} {{path/to/file.ilbm}} > {{path/to/file.ppm}}`
+
+- Store the input's transparency information to the specified PBM file:
+
+`ilbmtoppm -maskfile {{path/to/maskfile.pbm}} {{path/to/file.ilbm}} > {{path/to/file.ppm}}`