[colm] colm include visualisation

[Peter Reijnders]

Hai

Some time ago I investigated how I the all the headerfiles are related /
include in the colm project.
At that time I create this graph to get an better overview.
I used the output of 'gcc -MM' to handcraft a nice dot file.
 

Hopefully is usable for others in the future.

```
dot -Tsvg -o/tmp/c-mm.dot.svg c-mm.dot
```



Peter Reijnders
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