Implement custom argv handling until we update to the new yargs versoin

[BioPhoton]

We have a couple of functions handling the passed CLI parameters.
This is normally handled by yargs's option normalization features , but as as we have to derive a couple of options before yargs starts we have to rely on a custom implementation.

As a side note I want to mention that yargs's new version will ship a couple of features making this possible more easily. After the upgrade we most probably can delete this code.