light-codegen command line error handling

[b-gyula]

1. In case of an invalid framework parameter the cli still says "A project has been generated successfully in output folder. Have fun!!!"
   1. Should not log the success message in this case
   2. It would be nice to list the available frameworks
2. Currently there is no framework, that would not throw a NullPointerException if the config parameter is not passed. Until there is none it should be mandatory.
3. In case command line parameter error instead of the full exception with the stack trace only the should be enough to be logged along with the usage.
4. If the output command line parameter is not given, the current folder shall be used instead of "null"