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

pages/common/ppmtoilbm.md

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+# ppmtoilbm
+
+> Convert a PPM image to an ILBM file.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtoilbm.html>.
+
+- Convert a PPM image to an ILBM file:
+
+`ppmtoilbm {{path/to/file.ppm}} > {{path/to/file.ilbm}}`
+
+- Write a maximum of n planes to the ILBM file and produce a HAM/24bit/direct color file if this number is exceeded:
+
+`ppmtoilbm -maxplanes {{n}} -{{hamif|24if|dcif}} {{path/to/file.ppm}} > {{path/to/file.ilbm}}`
+
+- Produce a ILBM file with exactly n planes:
+
+`ppmtoilbm -fixplanes {{n}} {{path/to/file.ppm}} > {{path/to/file.ilbm}}`
+
+- Select the compression method to be used:
+
+`ppmtoilbm -{{compress|nocompress|savemem}} {{path/to/file.ppm}} > {{path/to/file.ilbm}}`