`--c-wrapper-include-cpp-prefix` should default to the value of `--cpp-include-prefix`

[a4z]

trafficstars

It seems the python generator does not make use of the --cpp-include-prefix when writeing including files in the generated C wrapper, but only includes the base file name. This breaks builds where public generated cpp files are expected to be found based on a base include directory.

[a4z]

luckily, the problem seem to boil down to setting some sensible default values of command line arguments e.g. --c-wrapper-include-cpp-prefix should default to the value of --cpp-include-prefix

and make the documentation more/better visible, to separate the C wrapper options from the python options

[stale[bot]]

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