convert to noarch python and test python stuff

[timsnyder]

          Before merging this, I want to:

1. see if the package can be converted to noarch: Python because it doesn't use any compiled extensions
2. add some tests of the python stuff (I think that is only cppcheck-htmlreport)

Originally posted by @timsnyder in #58 (comment)

[timsnyder]

#60 was already open for this but the only useful information in that issue was:

https://conda-forge.org/docs/maintainer/knowledge_base.html?highlight=noarch#noarch-python review cppcheck-htmlreport uses scripts section of setup.py. However, it's just a dumb script. I'm tempted to just copy it into bin and put python into run_constrained because it is really optional, or split cppcheck-htmlreport into a seperate package.