Add AlphaPlan FWR generator

alphaplan_fwr.py: Creates alphaplan software packages for the build release artifacts. According to the release, all relevant artifacts are collected in a list structure and the corresponding aphaplan information are added for each artifact (attributes, md5sum, path, etc.). The list is attached to major software package structure. This structure is written in a json file for documentation. Afterwards the structure is send to an AlphaPlan webservice that creates the FWR articles. alphaplan_keys.py: Generates a dictionary which contains all AlphaPlan specific information for the artifacts. Flag classes are used to define unique keys for the dictionary accesses.